{
  "manageEntity": {
    "action": "Save",
    "entityId": "1719653446",
    "entityType": "Track",
    "nonce": "0x1e83b23d97fd832ce0992e4660b94944e15d812b3bda532da0372d443ba94ed5",
    "signature": "0xe8f97f2891aa06d5903666208c199949c57cf42af8e38a9086b5a2621d5c3ae715904561e253ec450d3d080a5d9ba088c161660f6cde467cbe3a7dfa40dd890c1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}