{
  "manageEntity": {
    "action": "Save",
    "entityId": "687476632",
    "entityType": "Track",
    "nonce": "0x42a89d4024860d29cc69cb197ed31289546b4f7cb845dd1e063c2501208bd62b",
    "signature": "0x1b599b30aa76bc69a2fbf60f1c986f37552f51abd1987f356c85a6921f25d4df2f079d1529a969ed73c3df7173e1f0bfe79ae88ed2924ad118a50b5332686fb01c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}