{
  "manageEntity": {
    "action": "Save",
    "entityId": "761480712",
    "entityType": "Track",
    "nonce": "0x98c99eaeaa4e30c296ed2f16adcffe8a0d6a117c440d3da5fb3cd7c22dfa6f0f",
    "signature": "0x9533a1956aacea235a9827bba0f66bee3c845473050556ec8aa30211d9f7302b350ea4d2d19f2e6d7ab38c89265916756e9afc3971b83e05bbd64fec0b897ceb1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}