John Marsh
type: MusicGroup
genre: avant-garde
description: John Marsh may refer to: Politicians John Marsh (MP fl. 1394–1397), MP for Bath John Marsh (MP fl. 1414–1421), MP for Bath John Allmond Marsh (1894–1952), Canadian Member of Parliament John Otho Mars
popularity: 4
followers: 111
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x40ebaa60694ac8a5c8009a9150f43c1365310262dcc337cbb8e68ec96327421f
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954659
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954659
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dcf98c24-3cfc-4e75-a49c-28dff8ff7725.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/dcf98c24-3cfc-4e75-a49c-28dff8ff7725.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/dcf98c24-3cfc-4e75-a49c-28dff8ff7725
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-21T06:14:42Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x40ebaa60694ac8a5c8009a9150f43c1365310262dcc337cbb8e68ec96327421f","name":"John Marsh","registered_at":"2026-06-21T05:21:24Z","symbol":"NIM1832358","token_address":"0x1e527e412873459123304256c5577260ba416cf6","type":"artist","uuid":"dcf98c24-3cfc-4e75-a49c-28dff8ff7725"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40ebaa60694ac8a5c8009a9150f43c1365310262dcc337cbb8e68ec96327421f. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dcf98c24-3cfc-4e75-a49c-28dff8ff7725.json and https://artists.proofprofile.net/proofs/artist/dcf98c24-3cfc-4e75-a49c-28dff8ff7725.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T06:14:42Z
  text: {"copyright_id":"0x40ebaa60694ac8a5c8009a9150f43c1365310262dcc337cbb8e68ec96327421f","name":"John Marsh","registered_at":"2026-06-21T05:21:24Z","symbol":"NIM1832358","token_address":"0x1e527e412873459123304256c5577260ba416cf6","type":"artist","uuid":"dcf98c24-3cfc-4e75-a49c-28dff8ff7725"}
album: Thirteen
  type: MusicAlbum
  date published: 2001-11-20
album: Marsh: Symphonies Nos. 2, 6, 7, 8 / Conversation Symphony for 2 Orchestras
  type: MusicAlbum
  date published: 2008-01-01
album: Marsh: Symphonies
  type: MusicAlbum
  date published: 2008-02-01
album: Marsh: Symphonies
  type: MusicAlbum
  date published: 2008-02-01
album: John Marsh: Five Symphonies
  type: MusicAlbum
  date published: 2008-06-10
album: Marsh Voluntary 8 in C Minor/Major Set 4
  type: MusicAlbum
  date published: 2022-10-30