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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016ba4476c2f2fdfcc231ada087e2ca71dd834271129bff3408d0813d258e6bf. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a91cc5ba-b361-45d9-baaf-0c701be6fe9a.json and https://artists.proofprofile.net/proofs/artist/a91cc5ba-b361-45d9-baaf-0c701be6fe9a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Christmas Carols from the Welsh Valleys - The Sound of Wales
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fe11b514d7a843882c4064ad81a0de3f9236457996f5782e1faea3577fb3c2. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:18:52Z), 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/GBAYE0700053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1792478b700ae155316285a68cf709299fc14e1f3a1d643fe7ed96641fef8648. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T04:41:56Z), 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/GBAYE7600280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dbf9c05270b9ed36bc795c4f027271337d228176f196aba33be4140453e7e64. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:57:10Z), 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/GBAYE8100453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5967e55588aa79583a1c2fcb0dc57b23bbfbb5bdd096db4ed013486d87e3490d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/GBAYE8000193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8491d45fb88289b6bae643a8bff0358f6ce8d430de55dba863cbff8107712cd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBAYE9600396.
The Greatest Choirs of the World: Treorchy Male Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0fc3bbe98de37bfdee40bab3eedf77c36221bedea7718cc3900ad89f24e3ec. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/GBAYE0900564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d1eebec7488857b08164e17a7098dd0b986d6834d9aba2c901d9f74ae1a87f. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBAYE0900566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6b839199a89ed9647314dc55aea5701fab5903cbbc642f0d4b8f6a127d6c3c. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/GBHPD1100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5faa7fb354879ec127dda14d60bc01ebfafa9cf5dfd686d92fd596ca129473. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:44:06Z), 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/GBHPD1100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0d960393729ed03e3c5681c683ba495870a34d3cb38d71866378d199ef54fb. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/GBHPD1100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee749c213b5fac2f626f9bf88f8498d9cf4fe57b965dcb254119f99374abb157. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:06:23Z), 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/GBHPD1100076.
Christmas Carols from the Welsh Valleys: The Sound of Wales
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec03c80316bfa065c6877e85477e7ca2c41863d8b3e39a1e1eabdbe22465d51. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/SEWDL6142180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x302d4d4b4d1f89d8abae4cc1eeabe81ee82aacdc76a92bf5fc42c49c8e002485. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:50:48Z), 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/SEWDL6142186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac537e6c714588a2a9d0fe88a68c24605f7e39fe56e1ae362f6a137b583836e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEWDL6142187.
Welsh Male Voice Choir Tradition: Treorchy Male Voice Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c042a1d2ad3da074a07947b15b9b817e185c0f4c4c83f81316b092f33749f17. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/USX761796301.
Were you There? (Arr. for Choir by Hugh Roberton)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a66027ccc196e830c05c117be1375cacda0e4cca1197ea2034ab9e405e931d3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USX761796311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab60c5e8a643bfbce53ff30520cef2c3cb9cb287d60c0b431fde7aa0b8cc482f. Chain 2 (Bitcoin): anchored in block 959010 (2026-07-21T13:22:35Z), 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/USX761796312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d9f1edd551c8d14b5fad922dc341e0baafdabce462326c2fcd170abaea8acc. 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/GBMNA1019290.
Messiah, HWV. 56, Part II Scene 7: Hallelujah Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0ba2ae5a6d25aeed93b2370e2c87d4023beb0b9f6147f12536c4a6cf5e8e20. 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/GBAYE7300467.
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