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 0x423cf4e4a87bccf4213cf8f8cdc94613ac6faba28a40a126cbe2bd01626cff5f. 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/ec404443-7a85-4736-ada4-7ef8f68e917d.json and https://artists.proofprofile.net/proofs/artist/ec404443-7a85-4736-ada4-7ef8f68e917d.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 0xa9790918351d5f4de6fb2ff22fb8da89c4e03a26ca21824c6e2461c031023e13. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/CA89N1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cce203ef1a0a1c26ff00b355358bd5ae4490d469ca67a98792be06a575ebc4f. 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/CA89N1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccca7e12d218c009e1e6978449be45c01c4865d735817cedda1b967382a4ebd5. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CA89N1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a284a10f2a937d7f56b6c9a424769bbb9409e223af713ceb9312f442f749e29. 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/CA89N1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf681ce49befa80d2c0e207f8793490687ceea4b69de965e493f9fd399d542324. 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/CA89N1200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28299ffb87de3458ffa7895b715f5b1141d59bfcbaff75d5f72e716cf4646a62. 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/CA89N1200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3979ac52bc3fa12f244394a67b0e68b862e665df217d0fccdecc29955c7e7e8a. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:24:03Z), 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/CA89N1200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b726144c97ebf489c13c3d8fcf1f7aaf2f19c272ee56c83ea8b108d4cf8529. 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/QM9AA1574659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2aeb7777762529388fd5e7a03a3bd24ebd56770d1c672d1874bece29a6a6bf4. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QM9AA1574661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346ae4459b82eaf72898fe17a5c5156f038a19b76f54aa11e88b00e7c5086524. 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/QM9AA1574662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b675114e0f018b8f476356691f265094212053188d2240d4af387dd727f503. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T15:50:30Z), 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/QM9AA1574664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4edcf2752c1bf9e29c82856ff0e18b2977607c0910390c96e659cb3323c6f23f. 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/USHM82359838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360573818a0e664bf5fae14668bdb239557b922ad1a7a29c76309c43cf4c3e6c. 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/USMH92343415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x954de4c6ba89b23ff5992bc990452d877c4c638fffca6fbb3831a6b91869e89d. 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/USMH92343416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8f6562ed8a37d3ac2b116fca644648a5e13f757d1e72ec72cfb4abae8fcf42. 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/USMH92316147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cd36aec45bacba8b9d420027f4dadf9dcacea3a1eaa5b9217b1560f64eb8ac. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/USMH92343417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38fc9c351c357cdf2d41e5a34198b3752a79027fcde023a902996656f1c7193. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/USMH92343418.