{
  "manageEntity": {
    "action": "Save",
    "entityId": "2103874747",
    "entityType": "Track",
    "nonce": "0x3a49101809a69e7f2376e1531393e528a50b7a21cbc7713b6e169481a5891373",
    "signature": "0x2f423376c9c59eec998591eea83d2d861b78564bb3482d40b7e71fd20033b9a636e633f178ad587aec9978746671a0ba1152f2c6528afbb7d22897516f1e1a031c",
    "signer": "0xC2128703227276e4621dB635cBE2aAe1Ccd7fEA6",
    "userId": "747927961"
  }
}