{
  "manageEntity": {
    "action": "Save",
    "entityId": "124934984",
    "entityType": "Track",
    "nonce": "0x98210742bb14cfc3fe177beded8e11d31741b8ffad883cb4ae25620fd897c564",
    "signature": "0x28701896e54933bef9ba5037bd03b072bd8f9df420fb8ac162697d0a6fb5757d0b5b375021d2a3cec2cf0c1ad37483e39b5841e304ee969f67503ca4c48524621c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}