{
  "manageEntity": {
    "action": "Save",
    "entityId": "1664136094",
    "entityType": "Track",
    "nonce": "0x709af60e56b5f84ddf23c0c5f9e1bb7145c29c91d7611db823df4f9c516c4f20",
    "signature": "0xc3d04181570e25866081933b90743650b007ef7d6735f19621a67287599d725a7445444a478f639a6e338ac7f0723574f9e760f9f76ce613b8988ac7598853a01c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}