thumb|250px|right|April 11: the Rebellion of the Alpujarras ends Year 1501 (MDI) was a common year starting on Friday in the Julian calendar. It was the first year of the 16th century. Events Ja
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 0xf2f48634a54726ddab6e9ca3313d2a86a15866c2e8561b70dd8db834d484f6a8. 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/b58bd0e9-0df4-4311-a7ae-f15b53d18061.json and https://artists.proofprofile.net/proofs/artist/b58bd0e9-0df4-4311-a7ae-f15b53d18061.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 0x100fce66bdad292698d98ea1a3ed88a56b6171a8808eb7cdf12e04b436adef98. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/DGA072301288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100fce66bdad292698d98ea1a3ed88a56b6171a8808eb7cdf12e04b436adef98. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/DGA072301288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe385cdf893ee2d82f6c8036076a5a50289e75dccffaad26ee0d10c595f133397. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DGA0P2335103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd7ec078ee6a4c57d1b359856f272d36e13727df4b20d09910c4778c0d34702. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/RUA3R2125467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde31585dd2c0b3e05ad76e64c0e91cb8796f99543cad7994e3cadbd72ce359fc. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FR2X42487939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde31585dd2c0b3e05ad76e64c0e91cb8796f99543cad7994e3cadbd72ce359fc. 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/FR2X42487939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6beb9454e975b3beaebf79098dc342763bea9eeceaefde15056f4b14220fc38. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FRX282422108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413592523dea16bc319476908933643fd5457a0f946e426207c4c0bdfdc40b91. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DGA062486128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440ec4045c6cd61f3115885c460d5f928621d1457df0ebf52dfa37ce1ce73afc. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/DGA062486132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0daed80bb3cf246c238963f9a695e85b91fd3e0e52422541ad193810171eb4. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/DGA062486133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3256db5b845078a5d50726a0a2a2d7a662934fb7de41126d72ae47b2e127d9. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/DGA062486134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6beb9454e975b3beaebf79098dc342763bea9eeceaefde15056f4b14220fc38. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FRX282422108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440ec4045c6cd61f3115885c460d5f928621d1457df0ebf52dfa37ce1ce73afc. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/DGA062486132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3256db5b845078a5d50726a0a2a2d7a662934fb7de41126d72ae47b2e127d9. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/DGA062486134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61f86e8f58b5398056096f242cc3ca34fe2068debc0bdc471e6e4c7e2c4ff51. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/DGA0Q2433071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d014314c4b71ec30c2ae869c770c9817034d983c1efd869746489a361f20e6. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUAH62420806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01044751aad96d91704821fb80c9c5a46b051841370ec41052fe96362520d279. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/RUA1D2536027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffc83e25c90dfe68ea4d2c9f41af3c3b4d988380438b6abeb1181244a80594e. 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/RUAGT2535107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49011600b894684ef9d4fb5135df4c4196cfcbd4d580d49d53481254594a578. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/RUAGT2535108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd208888e3acaca629bfbc0af5cb2c8c082b2c6bfe966bf461812116f2d2fa12. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/RUAGT2535109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2dcf94165c7d47136b0a6ff5b78d966545c5d3663e984efb3e754015e03f960. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/RUAGT2535110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea9e5cd7cdd6a8f8f59176912533e175559f72cd3a0c709333cc26084f60414. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/RUAGT2561291.