{
  "manageEntity": {
    "action": "Save",
    "entityId": "1304762347",
    "entityType": "Track",
    "nonce": "0xcc81b2faa82c60a438d84e552ba969992c02ce47c39ae33e565ea85e8ecff141",
    "signature": "0xabfd1908ab01b25524243e7eb60e0b255b799dce8fb530d22c166de6bb56427c5f93a8e3240a0e0e59b3c66e4f99fb3d342574bb42f0882c94da58b1f43930171c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}