{
  "manageEntity": {
    "action": "Save",
    "entityId": "1496791057",
    "entityType": "Track",
    "nonce": "0x3c1490ce0d5065ccdbe9e7c8e3d90a00164015838d4ec1ff15aca0975ddc0be8",
    "signature": "0x39ef20a34d67250758a347b3aae68103840205f3481c8eb9ff36f6160b95b00337b4eceab1227f8da406f061d40b4e9e062feb90bc101d3e553dde1afa07bd7e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}