{
  "manageEntity": {
    "action": "Save",
    "entityId": "756836263",
    "entityType": "Track",
    "nonce": "0x8f1b51376ce3fbd506d922c1cf55ac452ab0298515f7b423730d51ddaa4e6c5f",
    "signature": "0xad7f7f5b1602ce0d9be867d3b0ea81c5dc8529f7d6d7d84141304d977397281a5778c9e8db93810d757869c6754907205556f5f06336474e69817fd8a6df39081c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}