{
  "manageEntity": {
    "action": "Save",
    "entityId": "51220473",
    "entityType": "Track",
    "nonce": "0xbff914e860e1c8c021de774c30c5641fe00b0bcfda608dff78235740549796cb",
    "signature": "0x6e88a8b805fad143481a7881d70200703cb2208282a5f5e0c68882790c730c224e135f978b159bb3771507a90153c93f9b8da24286745e1fbd9302e363392c0b1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}