{
  "manageEntity": {
    "action": "Save",
    "entityId": "243619685",
    "entityType": "Track",
    "nonce": "0x4af8feec148237364f2f109d2cec8f56faddf4573709dda369b10a58117daa4c",
    "signature": "0x7bf4a3e4e043bd38c86e02a4496a2866247d7fecd21a5a444a2f5246e9cd70810f8b4b39f4391b89c1d17fed2f0508bad7790bc65bb53a995d48ba76fb6b972a1c",
    "signer": "0x1b2c37cDA8248bB03659377cbd309183c2292824",
    "userId": "306414"
  }
}