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 0x8bea67af0245e9cb5de4809f59e25028f5d0e6e86f6a4952d302ec0e4735a9f4. 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/511d874e-ec18-45e9-bad1-48deffdae94d.json and https://artists.proofprofile.net/proofs/artist/511d874e-ec18-45e9-bad1-48deffdae94d.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 0xc18c6d342dc9135fc00eac06e858d6b784ced05b1aff5e49f3bc0e829f0dcb2a. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/UKJ8H2106323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f9d055176aaba5ff2089476297d379ba919c33efe52dcf8f41e385bf329148. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/UKJ8H2106324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cef791f628fc3f6e6e3ea9ae6cff03204b9f1f1a2c1f53bc113259ea7c70e30. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DGA092399606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799e46d853d62924e8b2932bdea2ebc44554465b0e650f43c382a5b7522cc582. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DGA092399609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa395d4e8e1e8dde96ae936920327676342113f9c34542f67770f83f8ef9cb9d. 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/DGA092399613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ddb616b255361b47ce8b1543c482fb6e68873e4aa1704a992d7efe72b7d8f9. 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/DGA092399615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4963b3489dcddcb9b13a4fd391c07e768db0b6e9d2aa348824c07b039f78b62c. 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/FR10S2130739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7961bb19e42fb2ba1748e3641e026217431f465456c31bf894a432d3c753d43. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR10S2203885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172c6e85f3bcf6e9f786ca4977df894679cc0b59f1494ef3814524e0e417fcea. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/AUBEC2170871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c82266e4278a6febe00f739c9eb9fb2e622dc7b98d6b24f9e82f766b06f4ccd. 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/TCAIF2496388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265137cd50028227fbf84fac1e813c0ee6f6464581bf8bc3b15023a3c8818ec1. 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/QZPLR2261828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75598a6367a51cd6794ae09b984a9dfad6edf20fd0e9ca79a81243c7e42c353b. 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/QZDA42211745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91c31871782aad803882bf304ba6a9c4192eafcc36ec96d724f6e7350cb7e4c1. 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/QZK6N2176605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cef791f628fc3f6e6e3ea9ae6cff03204b9f1f1a2c1f53bc113259ea7c70e30. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DGA092399606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x799e46d853d62924e8b2932bdea2ebc44554465b0e650f43c382a5b7522cc582. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DGA092399609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa395d4e8e1e8dde96ae936920327676342113f9c34542f67770f83f8ef9cb9d. 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/DGA092399613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ddb616b255361b47ce8b1543c482fb6e68873e4aa1704a992d7efe72b7d8f9. 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/DGA092399615.