{
  "manageEntity": {
    "action": "Save",
    "entityId": "1045778322",
    "entityType": "Track",
    "nonce": "0x559c1591ab28e08b120beeece0c7340404feecf577ad06e0e74988e7ffd286a4",
    "signature": "0x18e50d1c99fdd3d3b6c7736d44370854740abc08b39d206cb50c2a15c250ed824e5a0c7bea982f25a09f3174413293eb190acc4c710d3a38a09397bb6bd733851b",
    "signer": "0x8fb06be829c5718Bb968af1525d910B795617ac0",
    "userId": "950478625"
  }
}