{
  "manageEntity": {
    "action": "Save",
    "entityId": "819017399",
    "entityType": "Track",
    "nonce": "0x1900d68b333922a5991b23851b8eff96dc042f9368e50d21fd829b5f4c01d2c6",
    "signature": "0x97e5c62dc273f3f3d39ea8846268a9068c5cf12008ec7d088bd7a834d73ab569682a442b0ba0c9869c03ce33c61065e8bee917d02bd8cbdfe80b8e692184f2cb1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}