{
  "manageEntity": {
    "action": "Save",
    "entityId": "619562471",
    "entityType": "Track",
    "nonce": "0x2d00b8939276a61f172d5fccd6c4f0a095c2ffa9276e3f4e877dfc8d6760bf3e",
    "signature": "0xb98ce9fe72256e12fe3be656e8b372bdd4f5cf9fa758bbf4adaf37c444f91c996d13d63e1247356698e902139d58bcb3a88134e31e77cacb39911542711f149a1b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}