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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 0xbb693c858d8414ca2ac367371ca01d2221b899b2f7871f96e24b07cf15d5908b. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f92f1306-6b01-404e-86f1-1ec53fc4b111.json and https://artists.proofprofile.net/proofs/artist/f92f1306-6b01-404e-86f1-1ec53fc4b111.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 0x4aeb108849d9d40ead9dd0f8ef8b0b2f3d2ebc5b163f24bc9a769e523bc97ca7. 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/GBMA21908149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75ec5549516eea42a0310ab31eff43ce704935b526ea8f2b1e09bd630120689. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBMA22027331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x936c91f88c80e0e751cbcf0cdfdaf7e0192b9922f85dc205823896a563e89bcc. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/GBMA22027388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac04052e534d4eb6de8e4d6f4711651b3e45d109dc1e5ad8bec75a19209d5dd. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBMA22027354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4716d0d02f28e27455c9dd5f35373100cb2840c400c936357eb2bada4f0356. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/GBMA22027333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8af912da155e395f23cb5ebb0be3789df480023bebeffc1098266ac9e28dbda. 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/GBMA22027345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea5e4e7fb597c06b3cfb5dd53b686cabde90250d132a89b297b2e80a1959045. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKXN22079988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7feb29130046d5f0879b55c4bdd182447988814c7154ba75ed4796f71c4945. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UKXN22080061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70880534d38874bff786822ec24ca12498027304a25c6f92c28464871625e92e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/UKXN22079986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144130a8f6be85a2c98d9558fb34b6e2cf0120a18bb30e71f933078946068986. 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/UKXN22171554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a49c65def88af31e6b8e6608e2d4b5892d36d75074e00607f67ec9fa936ee2. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UKXN22186245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43aec1f61dd6a7d5b0f6b217d77c5444256ec763a0fad3fc9c9fb0535a3128b1. 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/GX3Q92017234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171563f832dda1feab8097f4592c086074bd7ff099ccc190ff65913274cfbe18. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/UKXN22328043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa40107b270ca3a4bda23ffd8ff69d999cfa3e2a4ed9648f86353278aae5bbeff. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/GBMA22456883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d15273218a2ae773a84d089257c98232b2455a2fe7f79af6ae7776c8680ba1. 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/UKXN22556798.