{
  "manageEntity": {
    "action": "Save",
    "entityId": "729279",
    "entityType": "Track",
    "nonce": "0x2f49406eef3264c8337f2de82af8a4cbc9cf67ee64e85d64fc2919088b90d055",
    "signature": "0x2f47d325177cd3d9d6e8ecc384b4460c029507a8d8144dd8b18636ffb8e5c6f069f9d97fde50de8e398a0fa53f6d48613d064261dd18d673dae57797c921c6001b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}