{
  "manageEntity": {
    "action": "Save",
    "entityId": "757742",
    "entityType": "Track",
    "nonce": "0xf152e935bec76cc14b71b7450e2b84bfafcee09c9bd6ab8cce3bccc95b8c2d29",
    "signature": "0xe0506005ad79601901a7ddf422c4bb804c498006efa8e3519dc0a2b4e7fe0cc61e73c6187e279ea69604c4d0a7b016659d5d29744336b4185e92556a0e90c2671c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}