{
  "manageEntity": {
    "action": "Save",
    "entityId": "304221439",
    "entityType": "Track",
    "nonce": "0x661595852b184f5060c75961594ab0d2e3dae4716c6f65cf46b5983045e0e6bf",
    "signature": "0x5ee29abd6dbbe3969a1a3ea6ebf7c967e2e4a9d62a823c2dac45e443657cba4e6ac065c6da0d3fe374b219ab82e875473e10fc48a598738b066fb040c598352c1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}