{
  "manageEntity": {
    "action": "Save",
    "entityId": "802948",
    "entityType": "Track",
    "nonce": "0xfc84118c15754ea18c24f2da5fe2cf8fdfe7bedf5461142d6b937d7ff137197e",
    "signature": "0x5bd96fa969bd40e15d5410edc3022d7cbd84c633a3b5c4088bb474470a090e4539c9a1ffb368d3e3cb66d7300281bc30385a6e894512e2c0de7e3de50a89e4481c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}