{
  "manageEntity": {
    "action": "Save",
    "entityId": "781984413",
    "entityType": "Track",
    "nonce": "0x9790e006c8d3c22a0aa8dbc42b37635af9126b4210770ebf6dacdb6ada8e2e70",
    "signature": "0x90cafe937fc87723ed5655daca0262fe2c8b79bef9d242bbe3842912572f95e52306b625b1455d11f8ede41c0cdd8c07491d401423df02b89a5c23dca41ed5391b",
    "signer": "0xd3899570eb603D3F4fB1536CD55F299186eEaD4d",
    "userId": "704607274"
  }
}