{
  "manageEntity": {
    "action": "Save",
    "entityId": "650358338",
    "entityType": "Track",
    "nonce": "0x7643f0bafb31ef69b5826daf3bee1a3c2d0e8e66fcc38938842aa2e2906c9f9b",
    "signature": "0xd9755d32401e46a7f319aa38c265fc84220678d53a1fc8572d3be08de797ec5039ad5bbb5c8d811ebf712c711671dc1122a81c4710f796561b926bb11e5dae471c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}