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 0x2bc579fc91ec3601039921e975b0395ed0425234d4447c8c9d583ca54a1987ec. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c6ff2ddd-8cbb-4f39-9603-92fa628b9a82.json and https://artists.proofprofile.net/proofs/artist/c6ff2ddd-8cbb-4f39-9603-92fa628b9a82.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
British Church Composers, Vol. 3: John Stainer
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 0xa49bb5201e3c931ed32cb28f1dd0b98dddb89c810a22f6cfc0139ab0a3f620c0. 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/GBXUX0883303.
Pater Noster: Settings of the Lord's Prayer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f76aa2f37e29171bdd3049a5a3347742b5567d312b162f0fb974813b4cc09f2. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBCEU1564919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36f9b867c587b188356a7e72b559bd8cd8927939cfd9ce8aa2a9a29bf5a0907. 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/GBCEU1678103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1a9a0d2159095c2d27ca60bc9c3c64e365583543139672a9e9546763e4d4225. 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/GBCEU1678104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9becaf6cfb6125c569d225cc8a43a1aeec81a2f7232563ba2c22e4650d9f56d. 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/GBCEU1678105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be091e77d64fb9058e87680fd0eee3e4952c1ccda4c9949b7805051ad897bb8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBCEU1678106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e8790644193ee21177d12a79ed604d585648f7c051f571051bead712c13d96. 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/GBCEU1459005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1947b702401405f482d0b6d20f3f23fd15e0ffab9ce7b25b0cfdfa16746c4a. 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/GBCEU1678109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e72cd205885cb32a85a85437ca68fd888de60191a3345b0f7eaa97f3a58e7d4. 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/GBCEU1564935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd56c145b7db126a6e1c263d74c2b3b61a07ce3ece2ccce9fee2e94ea1c12bd0b. 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/GBCEU1459036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70778d18452e12ec54229605c37a2b3b228a14b8253d87da2940adbaecbb8a7a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBCEU1678124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df93444e59ad14aec755974a0a51cf3c3f64d7ea714ae2c08bff55da077f94a. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/GBCEU1678133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b3ff208496138ecf13d3ce157dd434846ccae920131730220b3e2c5fc6c18d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBCEU1678137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703bdb12fb42a61d97c88f2faedba96db9eef2f001b2086c9c62401322dad4cc. 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/GBCEU1674716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa8703a235a70aa9921929b0722cd1fb9226af88f54b96d43854077db063200. 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/GBCEU1674739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fbc3c7fb6a5b675020cb4fb0306531cd15c32a088ec8a47944cde34b3e80b40. 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/GBCEU1678142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8127abccc14cf1dd8674abe4c5cf0a661b1d087943b958400b4860859f99214c. 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/GBCEU1459031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x330f4698e6ed8e01b47554a229364c9f2287b963844552c6c2908e41f23cb10d. 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/GBCEU1459022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9a39c4b313d7b9ace06c73ac791fec5fa65f1bf0f40c80138dbd7d56c9e9047. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBCEU1564941.