{
  "manageEntity": {
    "action": "Save",
    "entityId": "1836318639",
    "entityType": "Track",
    "nonce": "1786589242623282146",
    "signature": "0xabc0c9541f041b675265ade0cd3437e2134ecf025ee4df46b60c1ac3aee90c4c5650c3afddf14cb3ce6fdc33dc4ea93801b6816e4a8fd8996641e26030ddb6751b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}