{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553876129",
    "entityType": "Track",
    "nonce": "0xb6dc7f8208d9c818c2f12de164e2029420e67c12a867761cbf6795d87c13448b",
    "signature": "0x3793dd422c6220333c1913c909e6e55efffc4884189470bf360872666615ab3f3e2af1e8c52dbde9ab4ef0b600ee140bd89e62579434b2aa012e7a85a758f7dc1b",
    "signer": "0x4a32dde6757c86F147e3C1Af86284568E19D14f6",
    "userId": "985727"
  }
}