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 0x34b247a4f50a31af63d298cb41ba183de3f24288a63eb0b165906c33f5d39c01. 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/fb35549f-8ecd-48e2-9b99-5d97c6d63d16.json and https://artists.proofprofile.net/proofs/artist/fb35549f-8ecd-48e2-9b99-5d97c6d63d16.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 0xa8d679f0d8d473acfb2d5274ae31fbb30414bee9f1c970b224f142ba79524dca. 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/US7VG1971111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f856baa00bc60171011f68500a6ec6293313850b7560093887022d9110aa07. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/US7VG1971114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf922198fd71aa9b965d02d55da4ef43a059be1fd458b9d58ab647f2cdad9154. 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/US7VG1971120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6af2fb547c78db7457a73b9d8f785495004da1915c5fcf692dfdfa4b8baeb5. 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/US7VG1971154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf687eabb2f6c3b1ac0f0bd3d4da51ccdbf2820cea7e7afd704d75903485aa567. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/US7VG1971155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf53d6ba865c0e10257cfe174123632083560f870b5458d05b600f1efdf2b91. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/US7VG1971156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7482770866f74dd7230bed8607905f6bb0dfcd9f6fa1b009fd52ebbbe6bb6d. 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/US7VG1971157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccc2c0c3e47f52ed255154dd75f9ad3a12184f3f649e91e4b7b23b391d20676. 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/US7VG1971158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754b2ca04491a4e62ea013da663abc59055ce78cd8c06dbd040873f13307fb65. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/US7VG1967525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57cf0a40001cb7cd2126508beb9ee0e2370ce24eb25f5c2a08764b942fb01960. 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/US7VG1967534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f960ef1823e5fc891f35f2f4f7fcb6a27572467927b215a8bf4362069fa27f0. Chain 2 (Bitcoin): anchored in block 958572 (2026-07-18T15:47:37Z), 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/QZGLS1913606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc1d6331dedf308f10e1c0838770e26731f586661a4039e4836a83b033d19d7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZGLS1913614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36db80802f3102ac4c795768f29f8a200cc65395f25c1b5739c444d94d09c26. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/US7VG1971174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fbeb1f707ab3a7b904c33b875815ab41681472f658e41b5522052401ac1a50. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/US7VG1971175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112fb1f841ddaec77ed04c85ddc2a8bfe787adf9e1bd2e03c861a82e18874557. 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/US7VG1971176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa663a69fde93acf49a96752215805905d4f6110f451b32568c7f3d75d2964ff1. 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/US7VG1971179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ff25da5c51c17f91b4a137d880df0d1de4cc57cbdfa87cc7f5dee305446137. 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/US7VG1971182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9af3c6dcc2039fb45a9104f5604bb0254b9905c3d76afbc326cd81e9284335d. 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/US7VG1966391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20d22a960a39e518efc3f154303c3f989e70fe36b4607f88f32bb04b731dcca. 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/US7VG1966392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71ae8ccfa3ec1c2d79b056ab0b0fb92ac95e04b887db166760ae2cc975549d7. 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/US7VG1966396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e67096af18efb8477273686a8fa811d79a73b354a9f57d2e39149c2fe3ab72e. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US7VG1966398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031e0a28c48d94c7058076a55555afd1d7c89c9d2cfc802a735e82cca76f596a. 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/US7VG1966309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f63ad9cc960ab857e94b1f0e323e1423ae5eeba409170ac2c579eb284cc124. 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/US7VG1966310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e341b9c81e7dac7e0bc94df5d1d9ce0d70b39bea42409a82659493b166905e. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/US7VG1966312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a32cb170e852dd81f6d83fe23416d07ef44492ea73c2b81c3dd328b6deb490. 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/US7VG1966315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed4419c7a9acedd18ac751d56ecafd4a540b05cc8c7932046f58603145c7437. 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/BR0US2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985bd24055e739afd494ce24c6f4694338076a031465a9065dbb608423a45523. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/BXWI42500001.