{
  "manageEntity": {
    "action": "Save",
    "entityId": "773465",
    "entityType": "Track",
    "nonce": "0xc2c0874de5e89b207886f0b47facfe9738fb1bf04b0ab954665203460ff93c58",
    "signature": "0x3e7ab2c4a23d06c0931393cffd364977633866a4d6056f8ee18325da3f1fe87b0cb1cf31943b4b6fd97c33d201a25e5514d431ca0d6a49e62f9d526541ace4b01c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}