{
  "manageEntity": {
    "action": "Save",
    "entityId": "49853566",
    "entityType": "Track",
    "nonce": "0x165845ddac8aaf5e0261cc5f5d072ca2e59739603345d4327b58b460ce4d0e9c",
    "signature": "0xcd4f48b44896ec1b1aec7c9026741f84fdcf4555370514dbf3b3a962bed3448a1f56286c26ea46743ea15c0b2b5480638596dd20a6fd4fa4e49ab08f1ba626f11c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}