Marshall McGuire (born 1965) is an Australian harpist, teacher, conductor and musical administrator. Early life and education McGuire was born in Melbourne in 1965. His interest in the harp was spa
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938be734b63b63721b0f4c4a01c245623020b1f7454cf87c5fba96c828f68678. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bbd774e-1ddd-4f54-96c3-9c7868ccbabc.json and https://artists.proofprofile.net/proofs/artist/4bbd774e-1ddd-4f54-96c3-9c7868ccbabc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Love Me Sweet - Songs of Love Through the Ages
McGuire: charM - 20th Century Music For Harp
King Arthur: Fairest Isle - Arr. Marshall McGuire
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f6752ca4a1252241d31ca8082851d10bdad69e0ce469e941653af5c7596d27. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850163.
Minuet in G Major and Minuet in G Minor BWV Anhang 114 & 115
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd87c0368f538cb07db7dfaa28859c40a491b744244656ca239e31ea35126a7c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850164.
The Well-Tempered Clavier: Prelude in C Major BWV 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a3a893fe63f92b730a801e6799c592d3553e859fc1528d509185690778027b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850165.
3rd Booke of Ayres: Oft I have sighed for him
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98e8c4a5de1f1952aeef99a2fdb39fc28de645fe7a6817688e8a37b654fc53c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850166.
Lachrymae Antiquae Pavane - Ed. David Watkins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc888a76418dc8d5f22bf69bbe3a12c61d66387948a7e026073511c4639a2d04. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850167.
Abdelazar: Round O ZT684 - Ed. David Watkins
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c90fd51c593375f27511c39d2520e3f32576abd2088556d61042196a4f99bd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850168.
Sonata No. 3 in E-Flat Major for flute and harpsichord BWV 1031: Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7cae5aa7cdcab29798d000a65d4d7a6ca7b07fad0f8a72687202656ae360386. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30773b3fcb16ba3b267d68b13a041a909ece3893d56d6904efec8bfdcf18500. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850173.
Amarilli mia bella - Arr. Marshall McGuire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff2b3a5e4065d921ed02c46e5d91c9982b23eaa07e4df31db008a1ea2e79db2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850175.
Serse (Xerxes) HWV 40: Passacaille - Arr. Tiny Beon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d8d95291dfb9539a293e1c9ecb9c4a195865d641e9c0a828efbebda424e7f5. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dddede2468b11010af05a540a6e58e331415071f3522b5335c97cf43806732a. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c15e632b12f2a4a6c7507e614325abe68673db50f350f8eba3fbee52a4e8d9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850180.
Thesaurus Harmonicus of Jean-Baptiste Bésard: Gagliarda vulgo dolorata
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611f9359f62c9a90a12ba13c4e0ea2a66c605a11245f902f8960b77321921dd4. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb59c1541d40c9b05c568055962f9014c2c5beb763165828ecfdd71e60ca476d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a09b908a94cf28acd233adaa5d8c71c1c4ccf0b383176ab1c1c5f486388da22. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09950120.
King Arthur, Z. 628, Act 5: "Fairest Isle" (Arr. Marshall McGuire)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f6752ca4a1252241d31ca8082851d10bdad69e0ce469e941653af5c7596d27. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff2b3a5e4065d921ed02c46e5d91c9982b23eaa07e4df31db008a1ea2e79db2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde0efe5b1c0e2da1bdebf409dba7901134241d88c0c022e85800d558ea4e635. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09850179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a09b908a94cf28acd233adaa5d8c71c1c4ccf0b383176ab1c1c5f486388da22. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09950120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207517d95cef3e1912496221db8516e4a69420d90c944179961d07134bc13c64. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150084.
Bravade (from “The Dancing Master”) [Arr. Lacey, McGuire, van Eyck]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69e9dc34b9b6a8aaa121d47054753be728ca1200708a08e852632e370687de0. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16d87a9f5997d315da88af1ea770cbb31dac276efed9eac369fdba5925b17ac. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150086.
Evening Hymn (Arr. Genevieve Lacey and Marshall McGuire)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552e7c2f9241fd9f2f63033f895de6269760ae74ae31f713c61c7318b2bdf460. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6647cb7f72e7363143bcc70e39141fe24c8ee9f829381b2aa758c32653979b1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734874b368445d7d828a51f07d0f1d17b4d10f0e3f391894580fec170f2378c7. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150091.
Lamentation faite sur la mort très douloureuse de Sa Majesté Impériale Ferdinand III (Arr. Marshall McGuire)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d7cfc5fa778044b4637819bbc7cfe16873571f68a245af5c80702e6062aec1. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB02150097.
Schlichte Weisen, Op. 76: No. 52, Mariä Wiegenlied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fcbe4e5ca7b0fce8798ff7d8d279e4ca1ea176e61bdc0b680625b49ecd5a901. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09950126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a09b908a94cf28acd233adaa5d8c71c1c4ccf0b383176ab1c1c5f486388da22. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09950120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a09b908a94cf28acd233adaa5d8c71c1c4ccf0b383176ab1c1c5f486388da22. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB09950120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffec6ac0662c2f17dfb67180dccbc958f4a96059da57a663820806ad15549f91. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB00850004.
Swoon: The Ultimate Collection – Selected Highlights
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa706b171cdc984822d48fb0392fb8f212e62cf9fb29e42f9f98e582e839c6b50. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB00050434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713a5e998dc062b173d2c828a1afd3d6f7d0126c24a43c367a8a0e09ef2ff5dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUAB00650015.