{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554151608",
    "entityType": "Track",
    "nonce": "0x7db6d3fa58e0f552cc2dd1b68a95ca9395528c39d6537c43cbc810399ccdacb8",
    "signature": "0xfd9de2457b65a282446195fe1b4d7421cd5d2cf8de237c95314dc9952483ec3c0423755b478d74859a97cfc657c4d501a2ec4ce8e38d0db1a33eec42bbebc5461c",
    "signer": "0xE22639FD840080b20889373FEa6060B4757eB9c1",
    "userId": "274627911"
  }
}