{
  "manageEntity": {
    "action": "Save",
    "entityId": "890152791",
    "entityType": "Track",
    "nonce": "0x65586446515f9ea22e9e8f04eb0982de058f21755482ff5d31c3ff93b6ae36cd",
    "signature": "0xd6c177e35a39fbd71df07b3a49a294c3303d3707998df3fc53d87cf6154f9be029c80453095f5a557450fe7ae137cfb0bcac17c3563ef51224acac7aa82202ff1c",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}