{
  "manageEntity": {
    "action": "Save",
    "entityId": "669165820",
    "entityType": "Track",
    "nonce": "1786199200926078929",
    "signature": "0xfa7870781417a53c22ae188072dacf55911a8b8b2fec009e64c02f6e62c410707bff5a263a0c43b5841a5a238ce6bf5f923be32f886cca0f2ce2240aeef7fc861c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}