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 0xd0f1425275cb029c7fc4fffeacfbb63a507c367a2e4f6852dbe378da4257ee81. 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/3d738cbf-c620-4b19-9ef8-41f565cfa0a9.json and https://artists.proofprofile.net/proofs/artist/3d738cbf-c620-4b19-9ef8-41f565cfa0a9.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 0x74c0f3b3f961190651277f6e54ec223c7ab34747c8ff24638b9fefb902f3ff25. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NL1LE2001478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7334d2a67b0c5b558d5fbfbc1f10b2ca55091767dd66447b5a3bb6de74632a8b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL1LE2001477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c0f3b3f961190651277f6e54ec223c7ab34747c8ff24638b9fefb902f3ff25. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e2033d47438bafd5b2d9ecc0431045c47ff667b98e0da705933b43ccf1e570. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL1LE2001479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63d71ab2321746bdffa338dc997deeb22eb7051935bc0654ad34168b5a2db28. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76a82c1f663942f42a998b1d6d6c840fced082ad7027a119733c24ce65a935d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fa9c5813014a6662cfee764768604f5a4148647884d6b4d9020b6ac6114223. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1LE2001482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8025cbce8cbb339f177cb2ab1f8fb745eb57dcb0b0a7ef480c5c3a3254f80b42. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL1LE2001483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x317b5b556b7670ce0d7ab9ea84a1b66a0dc1089810f6e3f54c7cc7289f2adbcd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812c656bdff0475284e945ddbdc5233da5bba57720a23155cae70f7e43ed95f6. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NL1LE2001485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2483818e366e2607ba5a3e7b182c30e74662a899ed21ffb034aa0d523d2262ed. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL1LE2001486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e7517e92cfda52eee52bb23275cb21734e30754810297b0e200522c9fe4cd2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3513bbe87116786bd2f7ddf89baca0a3ded5ad692c5bf5d7ee965ed9c6c49317. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2001488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62b322595e3ff496fe552855f4747721729f481c36d833b4bbafabcdbaf2bd2. 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/QZFYY2371883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6281f2cc5f089045ac0a4ca1ec48e4895467db44ac4e884acd4b78c6310814a4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZFYY2398625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29a64ec84519274e6840f8586aea1cb123101753e2aa17032251c7d4713b91c5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL1LE2403651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a13a95d2a3b86a0b3f02c8336863bc49ce07d4f8f8ab673365d2b7885ff1b0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM24S1820710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76a82c1f663942f42a998b1d6d6c840fced082ad7027a119733c24ce65a935d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL1LE2001481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7334d2a67b0c5b558d5fbfbc1f10b2ca55091767dd66447b5a3bb6de74632a8b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL1LE2001477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c0f3b3f961190651277f6e54ec223c7ab34747c8ff24638b9fefb902f3ff25. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL1LE2001478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe4464dd5ef5db83734cb3d71a26c16a3958b1cf09ee94915f6ef5a533bb5ea. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NL1LE2102507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4139aeccda9f40ee6d15948979e7dd0249d405140ccbaaa21f1bdf0102fedad5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU1886841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11a7bd097ee7b91e58d1ca6db2a2ffee0aea5e2f574c4d302457e79adc91e48. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZN882135005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4139aeccda9f40ee6d15948979e7dd0249d405140ccbaaa21f1bdf0102fedad5. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/GBKQU1886841.