{
  "manageEntity": {
    "action": "Save",
    "entityId": "775930515",
    "entityType": "Track",
    "nonce": "0x67fc83229ff5987401a461ce933915deb61e6b1982fe0d47dab4150c10a4b36a",
    "signature": "0x9f51846e3b7dd06f2db301305dd38e981e710e4a18801a02ec1d9bd001540d942e785f0785f55da045498444c7230383d23552fafcacaef8e963f17e21c6e2651c",
    "signer": "0x03e9Caf2aeac5a0F0e4Be56410d67A4148D38Fd4",
    "userId": "47828528"
  }
}