{
  "manageEntity": {
    "action": "Save",
    "entityId": "622589327",
    "entityType": "Track",
    "nonce": "0xcbde51adcfa06430a73b601ae1ac2b4dfd11087569c8e1416992346ff11f379d",
    "signature": "0xbc85684413c124d4ade93dc5ab5ef3ce88f37a25d1c9314fa5e2a62b13dac6a01354de55dc6d9034a0c75ea551d997c8fe38acfa1e09ace558ca1776aa32c4c71b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}