{
  "manageEntity": {
    "action": "Save",
    "entityId": "702704457",
    "entityType": "Track",
    "nonce": "0xcf45bd1bbc115370e31c4b6a086a066cf820e67089f60ebacd1ca41f726f33de",
    "signature": "0xb5a0f129560cd37d546547159a55fbb77cec82c9df60379a65b6af869b06022d4077d2ffcd4a2b7e60fc27003c5de3ec0c5c11e142714e98e399124ea80393ef1c",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}