{
  "manageEntity": {
    "action": "Save",
    "entityId": "718672894",
    "entityType": "Track",
    "nonce": "0xdd6d6999090c50cb0eb329717696774b4570baa4d87e52af28be5f8d2a0168c4",
    "signature": "0x3df2846bcbd5745184d58f2f2a251cc7451a2dceb970b1da54856e7d4902e8b3787e4642104399e92788d067a20a7209c6f83826214e49714ef1a1818847b1c51c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}