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 0xfe506972a8f873e8a84ca8bed758c4310e749fb872c900d46d80150f48bb7497. 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/60e233f4-fea5-41d2-821e-445bb4e209ef.json and https://artists.proofprofile.net/proofs/artist/60e233f4-fea5-41d2-821e-445bb4e209ef.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 0xb47d79a9d96eefcf47fb6bd3ccc9292fd91a9544f86e73a6833caefc1018d162. 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/QZHN81916488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x994eae943e3f777d7d14cead464d2125516ba320470deb964f25ecaad24da054. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZHN81916489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4de04cab77db22e9a5eef86f12d8016494778877b417ac92429e40f489b9a6. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZHN81916490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbc40f92a5df02778ac272e01497fded4267d423c94e8fb9607f07ee941c22e9. 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/QZHN81916491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe2b4ccd189c89df6e840f9e1163de8e5044f83d88a822b04b68e99c2c03c66. 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/QZHN81916492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9fba8f226d18e3c2454b74a3290e7eb3e08759eb33b7eb38c1c0cbf8623d31. 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/QZHN81916494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06ff80d778ca36da72dee71e149bfd67b40f9dd6323686b79bed6375beb9eac. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZHN81916495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9794898ea4b022f6ca1e2c936164aad95a87014c3e08188964d8f379da3daa94. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYX1969787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3873b703888e3155393ba10b6c67348e0cfc03ed3bff919606efd68b4e3317e3. 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/QZHN81938093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e67fc12df6cb1f558960831c9004160196fcf43b238e8613b78e2359cac5c4. 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/QZHN91970413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802418e6766f6adcf58c92d9912e21d61e55427342a5554e9f960103223825ae. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN91970414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154f2036234a09470a4daaab55f337472b11074e967caef07f556c275e90e2c2. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN91970419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215df5526dc6d97c518d8af9b135a51219c78fd45f51b6617ad5d08332f640aa. 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/QZDA52093973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d5f5057d2d383186a97183714ad017e398e53c6c94b363054c926184bc5428. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZFZ62141065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2023b6789856ce0fe7c38e2f1ef99040b777fa6054218473b814399a1e0f51fd. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAU2149184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e2221c6e0f29295c5a2f3aa637155275eb7add80e4c24f2aa39025b33d991b. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ42208698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145ffab73fb490434a4512cea1ce04b08ab0dae55f5d5767f7e5c9b1ef456f22. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZPLS2208613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0e69cc0424d4a7037a16c4fe8d920040aa0a5c18a79ceb540d4e6d07e52b15. 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/QZKUS2401158.