{
  "manageEntity": {
    "action": "Save",
    "entityId": "293572",
    "entityType": "Track",
    "nonce": "0x8d2811a7954893e2291df2dec349b3634f28ce8c2c1a285bcfdab989d5e890ce",
    "signature": "0x614a3212fe6a00206632e0f2492a9dc35ef3f3934aae114936b999f47d305d9b267db579012ef7613f80dbad7c69848dfbf614642995bfc57dfb46f35c2716621c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}