William Croft (baptised 30 December 1678 – 14 August 1727) was an English composer and organist. Life Croft was born at the Manor House, Nether Ettington, Warwickshire. He was educated at the Chapel
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 0xc8cec44375df34c55b99d4d67b64e7258a23c35d908c035dda27a032c6232c79. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dda49de8-d7e3-4317-9748-e68a6f28300f.json and https://artists.proofprofile.net/proofs/artist/dda49de8-d7e3-4317-9748-e68a6f28300f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x791f4a7e280a764689916c79b4ba229f3f78ab4ce8a53b6526d94686b8933760. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBAJY0339801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a66d3267d504bce1b4346443e56f5f98fb5bb10d594fc291cae9888a3d0256. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBAJY0339802.
Crossing the Bar "Sunset and Evening Star"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e31c4e1b7a9e8c070c713e17a17aa695740aa125934f0dc13503cc7ad4deb1. 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/GBAJY0339805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3765c342c20669fce08348ce5b83a85f3211d782cd3b9d420877a188ba70ab01. 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/GBAJY0339807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b6869c9319709a2c7dfd19c43da5759cf0f9951ef6d1609ca8af5291f75f35. 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/GBAJY0339808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679dc7d8932f1280d889e43755c75d93d339c38830ee4bc005bbc54bf6376822. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAJY0339812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335f399b01ba394d662c735596016f81307ab55bc29d2a350881736a8d4713ff. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBAJY0339814.
Sound the Trumpet: Music By Purcell & His Followers (English Orpheus 35)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e05a57502e07fe932cbd9885b4b36aa662fbc942ae10b10dd23ecf4d903632. 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/GBAJY9581701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d038c28e03b74a9186fe6535e98f1db69212e5129b03270578397d69d7c253. 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/GBF077141906.
St. Matthew "Thine Arm, O Lord, in Days of Old"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4497fef40074007750fceb25915d4b740a18d4f4e3eb8968f60c4d3534d4105. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBXUX0870505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb1dd7cbaa7e1454d426da1e535ae9d1e6d82eeb235e7106d5e10d6edfc48f27. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/GBF078540606.
Sonata in F for two Recorders and two Violins: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbdc3e87f8656e85fcb0a70612aad5f09d96e1d5eda30c44eb22721a747383e. 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/FRU621836826.
Sonata in F for two Recorders and two Violins: I. [Allegro]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4b2aa9c1c1ed550982cd4eb3931204b1955018c53444f49b1cefa5c2fc4242. 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/FRU621836825.
Sonata in F for two Recorders and two Violins: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb787adea2fa79c4e1b27bef17733a5733fb8289ba53fa3054c1f02ae80622655. 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/FRU621836827.
All in a Garden Green, Four Seasons of English Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f47c8df17df16bab5705889898679cdbd50b693cf3988b6b5625880171a72a. 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/NLY331208143.
Binchester "Happy Are They, They That Love God"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09db4a51569f8836b9fd53030275386f5c6fb7d3caeff066843c7befddde47fb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBXUX0870203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc7877ffa56cbdd7dafd5c1dec5dbd8fdf4c6827e9a4b48a9dfb3019146b475. 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/GBAJY9300113.