{
  "manageEntity": {
    "action": "Save",
    "entityId": "1395903772",
    "entityType": "Track",
    "nonce": "0x5f371ce2b2b45a2c126acfc1447519f67fa8cc5484ba4f7f1e05f1c08dcd0fdb",
    "signature": "0x09fcd1b44c5de44cbf9a8228c15677030ac44c485b9c4abc48bc1a6db15ab4696ef4609bd576f23599167a0a9681a681f4ac5601f5fcc278f7811d9f7be4d1311c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}