{
  "manageEntity": {
    "action": "Save",
    "entityId": "1049503890",
    "entityType": "Track",
    "nonce": "0xc16b7e561e67865147fe8e70950c9b424c156a1c06b31f0b5213dad61bbabb47",
    "signature": "0xec55678499051cad40681c9ad49b20d8b99bc143a86e646b299a016064dae43e1caad8129660875ec3cd46e0abc39d5982b1ee8538c93263e9e39e7585bed5211b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}