{
  "manageEntity": {
    "action": "Save",
    "entityId": "1219619843",
    "entityType": "Track",
    "nonce": "0x571a62b558861840467003f46961224525ae6ca0fde6fbfbd10ffdb4fdfd720a",
    "signature": "0xdee9248af13ac9f9e277c339d4873acee3ff6734481d19b258f7bcb71170b1e14bd6d3e96abee2121c41ddc35fcc519b426584054d9c0971a92ac3d7c55d88941b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}