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 0xb0fe4799f8436b62572f3d3870f04aa09be9bc966d5771841134fa6cb506a4f9. 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/9c0fd71b-a5ec-4e1f-b6d8-7ab19cd7b957.json and https://artists.proofprofile.net/proofs/artist/9c0fd71b-a5ec-4e1f-b6d8-7ab19cd7b957.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 0xc100a4fa1bff5137d33105bca503e4144692a9820d8dd15c257bbba2d3619f96. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAEY2036529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2373095f8a295d2b512039b59d9f32c9cadf7ed1dd9f97ae10bedb0dfe1c6aa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ7D51701744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f328685c3e975a592d71e7e4e4ead35660a1ed4a5727ad4fdffbb5c59d76ab0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ7D51701747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b77c5b65b26481aeda9a86287888885fe111b03232da5755722665429775afd. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:11:15Z), 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/QZ7D51701748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f894f3b12628a62441704a91c0901fdc2d31df47cf8240132eaa3c83a1317f1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZ7D51701750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0725f09499c9ac9675f41d7ed84e28b6e5e029a95e0dd55d709091beb60fe5. 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/QZ7D51701755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bcfd01e0cb50e88b2eb2317f2dd41c2c1edfc3cdf7fa98538ed7d2be0f794d5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ7D51701760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae532fc6056e7cebdafe4bd3b7c57fe93ceced7e5a6661875058175a4efbe78. 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/QZ7D51702093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390292b6d7e9943d32d7be2ee5cfe5cef19e3024843ea65e9c98fec2cfef1b7c. 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/QZ7D51702117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069668c4558f9030348971c09e7ea68a6eb4e8d5ec0353199bcc7dca17533976. 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/QZ7D52100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88652e25c239d3ce8ca8055fbcf46903a5c898b92e958c196a5d27487aab075a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZ7D52100575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c02dd7b9684616e31b3e9b8dc58aef105dde50ec98390863c08e15b945bd0b1. 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/QZ7D52200130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23456731db9de9f863a791704d22392c1554b7daf63768ebeeae79ec943f2512. 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/USA2P2425049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9b617394389d395324433dfde5ba2c57b6d62b138648a39fa7a917a4076265. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T11:01:23Z), 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/QZWFV2422545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936fbf4cebd3728f09fee36dd36fc39c71c35a4355ea857a07544e86cdf8cea9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:10:50Z), 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/QZNJW2581560.