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 0x9de37dd3f2bace4d8c0d0555113b5b63f482acc476142521e83801fc21704efe. 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/08f0f724-4b64-409c-899b-f14e8c3ace67.json and https://artists.proofprofile.net/proofs/artist/08f0f724-4b64-409c-899b-f14e8c3ace67.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 0xaba65698dafc12097ef3398a67ea51c7f36fa032e2d38b416403e1e200ef1de4. 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/INS181702009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1a311d7f448313ec063dbf932da712395cef4d37f35b2a6eca29e4f8ae21f7. 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/INS182303196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda3e62ad1e996019f53b71eecdab58e634813d18d3decc5a279327cf9d45d4b. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NLRD52403113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7580dc14b4b687bc8465a001cbd6b94891a622225441546b2c9a71e920e3e177. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/NLRD52413122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04672e4c52f9ffe90c5b253c1115a0f98a6117315cc4cabe070b91f7e4c138df. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/INN2I2402755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4afeccd0e5aaf0760f47ba4bbbf6cbe9a1072cd37b767a7b235e933729d0d9. 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/INN2I2406583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47004a784866b7e87d23c336ffd2055a58ea6dabb93dec09ec1ff4357ece987e. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/INN2I2407444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cc95c091e146aa3a846547dd9e14df7dbeb542fb5b996caabbc9a807cfbc920. 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/INN2I2409694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b6dc214d4a4188f2f3c4a07d4eb62f6c9a805c2802804e8263219a6fe81032. 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/USA2P2524275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507bab1c1073d88b2f1a0df06de991c98409fbf28a114d24d54b9aa7d248f43a. 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/USA2P2524274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8234dc2b018b5b1e8e2a2db24fadcf9c08144b8e311922d1c7a23b9ca008e03a. 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/SE6XX2575293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3236d21a0000fc817211ec04e5e404819887de73262af8a9211184b51f09a27. 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/SE6XX2575294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87ef07b064ef0920afe7153ca2ecc7ec34bc5dc578a26a4e121b77dbcce881dd. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/SE6XW2506946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e927f40209e71edbf30b8b0d3444aba7a55dcf4b88cac94cbf238709e77dc50. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/SE6XX2575439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac1ba71e0958fd06ebe3797a6b9137a834fbf95a2f0a02fd7e00eed5027bd80. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/INS181600633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf221b5ac6d881494b957f5c9e7cbe71cda2348119a752e3ba6a49a73326cd0d0. 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/INN2I2401875.