{
  "manageEntity": {
    "action": "Save",
    "entityId": "506753",
    "entityType": "Track",
    "nonce": "0x4fce33d9829dfa363969076861a4661c06450d103724af2868742c7485a41d35",
    "signature": "0x7501eb4f37f4f99f00c5bd9210d30d2abafdd642e925ef45a7570ead838dcc7a5891e07ada18f0ce026168fa3767907bacc893288c4d5b36e6be44f68332812a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}