{
  "manageEntity": {
    "action": "Save",
    "entityId": "1224821603",
    "entityType": "Track",
    "nonce": "0x42b2a4a88f804e36ec5388b88d85ff74a6182082e2f04d87c3e86eca3c7912e9",
    "signature": "0x38980fea37c0e6011823dbd2788aabd2492823e42d09068f5bea21217d43f9b910e6fc1021e2b27149ac23c5a27248496461c19ada6bd0675c3788b26db1ea371b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}