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 0xfdf1cc4ad76a83ecc6ca42c7c62f53e2b87b19981ecba03545b620e02416a1fc. 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/083e4c9c-d157-4b60-9e77-217149790895.json and https://artists.proofprofile.net/proofs/artist/083e4c9c-d157-4b60-9e77-217149790895.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 0x1be22dc7892a1f7b31e39a8b2ece859e66217702be743dac9d65eb7736d048ea. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZWDE2430623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b628ba1365e9b6698c84953e671c1b3d1e3643c183384e6ae6f70ffed3d8210. 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/BX4IU2357774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531c007d1ac8bfad1c853f780b3e73892991c1a513ea48899e44422d9df0a3be. 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/BX4IU2353352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0274cf4a614498b729849b337d182d64ca45bf7612b7b0f4cfbaf97b52673b88. 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/BX4IU2349840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75492d1f30bb28a524060ebc9edb72c2f918300ff6ac78b81b03b4f5f55de74. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BX4IU2342294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x813193b7800c14bd58126f07fc6d1dd333d2ead09959172d3442c52cf24752ad. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/SGW502349700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7acc9f14f3d3fd92e1293eb22186954e7d0db17b13aa3c5e6096f71295a208. 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/BX4IU2337660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7b6ed067bbf6b4d91cf19f63166af6e6302107be5ab6769da748d59cabc72d. 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/BX4IU2333387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10853b0933c69f3de36fef5d22f4ce755f991c6847d253b7728c38b09166a9b1. 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/BX4IU2333754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1f4ac5db0164af328a79b07aa141036d5c06b25bf38fd0af72a5c0539dde59. 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/BX4IU2333752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c57f34472e13eff9ce70bc0475e790f095c53e7358dc128d18cb9f7fe58eba. 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/BX4IU2317537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5efc4b6926655261e529e23aa852cb47ed0c98d19711c0689a462b20729276. 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/BX4IU2315616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc33ba8deefd1073863a71d5597dd075a634ce3c927db01c793fcb027e968f2d. 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/BX4IU2310826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845fb709b6ac590fd7b3d1484f17d8d87e347f57d1f1f56aa162f6608a2b05ca. 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/BX4IU2308875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2864ae42be5a67ff8f0ee166b377c30189c138a5d095803423fc942d231c1eef. 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/BX4IU2309252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8a2e6ad322f99cd387113e93d2d1efba09c718ec552387a4c182d2147962a6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BX4IU2306557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c70bb5099d4c58ae36502ff0018cdecc5994b883533efbeee71dd7d8c2e057. 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/BX4IU2303733.