{
  "manageEntity": {
    "action": "Save",
    "entityId": "656595",
    "entityType": "Track",
    "nonce": "0x383c394161d27f6d3adbd50f91416a0a88cf1fda2850a20e1c9f9813e2b46fc1",
    "signature": "0x6152dab513cf26432e31c857d523ff6bc596e5e8417922ebc7b4faaf12b924100fedb8edd0018c36abe9967aebd31c3e36d6b88e339a3a456d53e2d7d2e588221c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}