{
  "manageEntity": {
    "action": "Save",
    "entityId": "213747608",
    "entityType": "Track",
    "nonce": "0xe9800f9fd0d76937ca28f19ff93ab8a5c7b6a381171deb2f97145d17c2bf9418",
    "signature": "0xb041c63df6eed473dc8d1644e3b89f1e2e519392afd63df1342c8f94dd888d6d21ea65a54e25df681dd2648312cb9987333550452b948da9696c4d883517c5f71b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}