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 0xc19fbcd800d0b5cbe619bb04fc2bdc90683857b849ffa270e3882e0a291bbfd1. 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/af52f4bf-ebcd-4d92-80d5-c50286b1dc20.json and https://artists.proofprofile.net/proofs/artist/af52f4bf-ebcd-4d92-80d5-c50286b1dc20.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 0x0e246c702a185f945462b0e3a873eedbc8635d169a4287a10ec8a78dfcc436cc. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USHM22163319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccebdfafe3780ba820c5061ee0843822da6b8d80a4ba8b19fc32abc27d43a672. 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/QZTV32388302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7915d56a3c6ec320faf3f73b15bed51f8ad444202ab7ad1c7ec9ebd80cda94ec. 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/QZTPX2301939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1196a12baaac0d2a3f256f9e7f7830eb042133a11dfc68de3f0cb5ce971ffb. 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/QZTPX2393832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c2ccac52f241a22db58fdfb05e2c8450bf0fe73dfb547ece61f920738a8391. 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/QMEU32315689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa691eec588cb8caf946cec30f05ae085cce156d8f4ab37fdd6fc4e30dc8143c3. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QMEU32315692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da75cb487eda302bd950c26edab91a03d690f0a5b86cfbd66f5cfb08218289b. 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/QMEU32315695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c2ccac52f241a22db58fdfb05e2c8450bf0fe73dfb547ece61f920738a8391. 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/QMEU32315689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2883b3f54effebc2862098e1a56f994b955278fcbc03f7d22b166f3fcc9ec91c. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QMEU32315690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1145e19115f513f17ade830f7458c9ba58084d0f4aaeb48d91c4faf951cefec5. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:51:59Z), 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/QMEU32315694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708121771bbe61504ef14fce2cc5eef401d6ebdf20417ed75d2c04e10f1c877d. 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/QMEU32315691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b591b23fadd24cd2b7b16a4f1ce02fe55ccc9067f889d047d52a52994d19a4. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/QMEU32406993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4124085c76d8b60df7f9eea4a455ce857cb08e519fe878da4e880a570ecfbf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QMEU32413651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb32b89224a338e830fb79148945c2f70599610d5ef7ddc921085e20f3696977c. 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/CA5KR2506116.