{
  "manageEntity": {
    "action": "Save",
    "entityId": "703999",
    "entityType": "Track",
    "nonce": "0x6d9c35c54916aa6652791ea43933b223c29fc8273690d3b1d93af51209cca5ce",
    "signature": "0x5c35b3bd0067f26d2abdb666886d8326bd683ba68058d4bfda3720246b068d93731a4ab7a2da5d37aa8d82a3cbef2bb566c5b9d3c36a43875073b9eabb3d21bb1b",
    "signer": "0x484d8957F3f2AAC8A75b6c9769692fB7Bf806850",
    "userId": "413536646"
  }
}