{
  "manageEntity": {
    "action": "Save",
    "entityId": "454743934",
    "entityType": "Track",
    "nonce": "0x7985fcde214bebb858a7c6d092ed18305a2bcedbbde9bc415ef5aa8ce8c11634",
    "signature": "0x3ae2e6558d024f013a291d6a4927ff0ac34f61138127e192d6e21e04d103442d7b01a4434e35f0f012e496d2aad7a91b7aea5c5a016668ba4386a237fcc123d11b",
    "signer": "0xBBBE9eFc177a4E708d317195Fa81aA6E8E2F7E92",
    "userId": "557135181"
  }
}