{
  "manageEntity": {
    "action": "Save",
    "entityId": "738825359",
    "entityType": "Track",
    "nonce": "0x0c0b2c70964204156be08028b83ae019c519b68f32b3456b574856a4ea4641e7",
    "signature": "0xde529a0dcfeaabd5bada2f87b1cb8c6d73d02f856ed1fdd12987ceeaf787765d3d32f49dc04de9a295cbbdd248c2c2d5a2986865e9643c440584db222a32956a1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}