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 0x07aacbc615cda9d15d464ed8789af44bdba27d6b160964ff41c7e8426e476574. 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/4cb81c7e-4337-4998-9620-7887353383bb.json and https://artists.proofprofile.net/proofs/artist/4cb81c7e-4337-4998-9620-7887353383bb.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 0x7f2ac62ff764fb79b6be0f3a50a3256c1aee777413f676677931a00d77bb4f20. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHN62284999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4bc06f5a08057ec815557c043dbf44239b44a990c69c74a76fad36bab87c9e. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:11:10Z), 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/QZHN62284994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x426bb71134104c66bee1da0570473cc63a6a5771e120fc0aee681ab03d639e40. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZK6H2222394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e4a87104bfd9063cb6635a3d157d2878a317c41d75ec305d72c5748d505eb3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHN62284996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd404f89eafbd98bb29481ecd8948c32b7e4465e5e27e2e0ca446fe6ae9a0fcbd. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T04:23:42Z), 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/QZNWV2254800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a38d7de3adc8ac1903050f3a6062798fe6f1aaf043eb768c6035d2d691c55be. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZHN92379908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcef189cf861ec6720269eb6fa470254617e80808fe6d74573707c9c0107563. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWX2370280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e107242c761303d9e8391693762424b4973157ac26f476aa34bbc253e00a8e. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/QZTB72394298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ed0884e8ad5e0682de719ee376cc9216eedbec14cda66d6b961d2fde2adcf4. 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/QZFYX2479111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac53b274450e2ab78621d7ca4e78cb7fbb64514b44afe78f70d45860f262bb9e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBB2342542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797b668f0737d63374aa9022ad9f236ee1ee390e41c35470606c0d33c4fe8f4d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/UGA2F2400102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ede08e01cd97d54da4e3f1ca74d86002d7a3b09e5b48a884a9055f0148b55c9. 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/UGA2F2400177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4da948d2f6eb887a9805e9a3711447f2831e52ebf6f3b436e9e54d9d78b20f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/UGA2F2400292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff72df501ff1bfc52a93142fc0bb8bdc04026ec7639baa98a6babf2fef538a1. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/UGA2F2500083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aad0e9de46a81e395f25f7c6d4653b7715fe640c4bf43facf4ddfd29ea810ff. 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/UGA2F2500085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9f7e665d2a48adee2ebe90c4878eb9d8eb1b44ea25ae2bbc489f20e2cddffa. 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/QZNJX2509258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff81cb2d1058d6527b239b6a6d9d628174eac4268cfee279f5697f0b225ac68c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZNJX2509259.