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 0x809612a9933e996f868751e3245733e145f06efe1f83d052a05301feeaf48b5e. 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/29dea74a-9ce8-4a1c-96e0-c4642c0ee875.json and https://artists.proofprofile.net/proofs/artist/29dea74a-9ce8-4a1c-96e0-c4642c0ee875.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 0xbb02e2d1baed62d7b16310a76951b171f0d9281acf72530a5946b7955b5c5657. 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/QZES92303613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe9845a3df46e1135f247b1a16652568f76da880e3096468a1f15fe519d6269b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES92303616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af7cdbec62def9fec64f3c41a3017cfa76b52f5d571c7652aaf1ef176715200. 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/QZTB32368866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34cd5610fcee370ee2e3f828290b0601e6f8d95e846f0321d3be9434da91ac9. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZTB32368867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecaeae73703d17faaebc1a27ec299990af885dd116116435cd50b6994d05d51. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:50:27Z), 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/QZTB32368869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f54e4c76bc0080effabf09f52ee6e9b4131276031771578380bfda5fe5af5ab. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZTB32368870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae16ebc9c393893a1d934e185073f0be22bd9c5adc9838885fbbd23e4954a640. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB42496446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12618634a416fa29509f21685dc0092bb014abd005c74f893f6b27cc6fedbeaf. 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/QZTB42496447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0611375c35797ec40a856d6ba42bfaca7a3b3aa5c08fc85f28a496b5b3899e7. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZTB42496448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb801a705f720d5ca7c32563f8073aa77815590df346e7a063041d284823d94c3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTB42496449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7ca832f1f14e965d26c7315b259ab4c9039a5ab5d5eea454251bf2391358b1. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:41:30Z), 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/QZTB42496451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc7407507b001a0fbddb3f0e8c405df63631ba6458248191a39771c03bcdee1. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB42496453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b456235e12714fa66a58a8778d3b9d437bdd4ce1813d4b35f69bc57a64041c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTB42496454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204acbb2d0811e6e548c1ff2a22bf38f66d06a7eddd75c3bb9f67394a546bfb6. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTB42496455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca5a844db42dff643f6c088f097ed58822c954852d034d5013369464f2026e6. 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/QZFYY2588042.