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 0x2be5fc5ec31f68c8657575f75f3b6d34f2547c0b00ef4b2c46da47fcd9e5067f. 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/3e27c867-948d-4da8-9e0a-f3db3f750b5d.json and https://artists.proofprofile.net/proofs/artist/3e27c867-948d-4da8-9e0a-f3db3f750b5d.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 0x6731ad13fd08ee9d657416a363c0301af7c97a4db04d43c11a5146bdf1154b1e. 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/QZK6G2291392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e57e083bfe05c486efbafa6eab13e9e9670ab1c5135ec0d7948db2d1acc870c. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZRP42274334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b3b76a1d1be0971358ac9108a0dbc29520ff3db6c38f14df7bed0fc7bbd15c. 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/QZFYZ2310918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a44371cbeba5152a26a019634a106b1b46b88cc7e4082b41e31b22a38fdd74. 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/QZK6F2100457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae205ebf55da39793626ccf4f32e76859fac9622e18e9d6e9a49b75352aca5b3. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QMAAK2327978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd318d0cf7305fc6ecf093fc0b1ab6d1e439db2884989afdf427feb2e36604f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMAAK2327979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830f1b1a91aa222e6849b379d3661c649ed5cffaadaeb44ccd0b67499e9c6af2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6F2334175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc92e7823e6812374317fe289951eeb2c1c6cc5819fd5c3eacb107af84cc1932. 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/QMAAK2327980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed6f3338279a8fdae1186a4e5fe8aa3f833d6363162bde9e2e5ef19a4730bd2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6N2167161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922c87b039a0526884fd30324f082cd106add1b6eb3c4c5c7ff9de15544ce578. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHNA2433670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddb286fb70fbaed0c61ccb0b2ab8e72f87f5213c22bcf0f5fadb8c39a087e28. 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/QZTBB2382436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5078fc26151ed26ac80021d243b62d8b2560c86595a00ca6b32f6178b6b7c242. 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/QZTB52319691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40261aa6c244d4192b48a44905f4a74d8cfcd4270f027b519bdde96b4ec50564. 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/QZDA62472038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe969e127ccfa3bba0c0f44132b5cf2dc2d00d7e919ce4296f7520cf3e2265c0a. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QT3EX2459570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fecf1354d182dd1a356b0ac95dab5d1e6d9c22b8924b93e98cff68abe38cbf1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES82476159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e3cf5822420aa49e5ccc94e809315ac7b8f73cba4f9c72ea679fffc8d6deb18. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZNWW2445060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0627330f001a1254a6897278fa5dd5d69f567070ae8fe0847a492fec4484fed6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZWFJ2455318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cbcdd38508850091b5a53f980272f172dcc1422cf3bf37da7a88b578144d4f. 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/QZWFL2414245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7535f84292b34e23322a7a694aad7dfff0d33646517e0c1a088db1d9bf8ee055. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZWFL2432514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40261aa6c244d4192b48a44905f4a74d8cfcd4270f027b519bdde96b4ec50564. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA62472038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ddb286fb70fbaed0c61ccb0b2ab8e72f87f5213c22bcf0f5fadb8c39a087e28. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZTBB2382436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5078fc26151ed26ac80021d243b62d8b2560c86595a00ca6b32f6178b6b7c242. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTB52319691.