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 0x9bf3ac48370677a8debe8f4e870bd58c987b7c87cbad8dfa6b2407c9eebf037f. 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/fc91ebfa-3476-4efa-9d86-cb704a43686b.json and https://artists.proofprofile.net/proofs/artist/fc91ebfa-3476-4efa-9d86-cb704a43686b.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 0x2a9ca3a8ce2c753c4b8158f5b952e824087fdce0b1ae683245e7a9f0cb65f63e. 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/QZG2X2402759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c6515b95af7d55192628ca3f9b89891737e0404b7d97d367d3f9ecfca4cabc. 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/CA5KR2230423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ebc0057beb61c0db963ab34924dd84edbf3f18c1fcfbe42295f22a1bfdc269. 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/CA5KR2216028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59126f6d074db279b8aaf99710543deccd5b2756f25d5143630e81db6522f4bd. 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/CA5KR2354831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ab4de95e33382f51ee1e4678b69d6ec94833e54e635852edd3ec47fcdde5d4. 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/QZXLZ2401670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfed58f205164121cbcd11b088171fd4453b175fb201144ccf7faa59b5b83b1. 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/QZXLZ2504806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115d8b27052be04c7de79d89bbf291b3d1bde04843b49bd93f381e58143b438a. 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/QZXLZ2502674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf668663ff86afd43c4ea3032277985aac8ae700340874a65a9ed05a75172fee9. 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/QZXLZ2402301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675582d5d1c45bbd43b513bb4622a36a12f0e04b3052d2192ba82ebd15971fa3. 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/CA5KR2473538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07073a22a034fe9627d9466c93bb0a0bdae20b375a7dce8500d630f8043248d. 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/CA5KR2465328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6834b170bd9ae16108674c04f2404728358b574626bf0c1716b8db8c2d9409c. 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/CA5KR2366847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90237c4da708a83d16ec9ff8dc3fd178b7fb673bc4e48513315e76b94df8ade2. 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/CA5KR2365701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442069ffbdb97e90355ab3feff0d6a1bc58d4d2cd13e0750e62096866f643538. 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/CA5KR2365420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08db0afc02c3291a6281b44f676168b2e1c53fd6daac8c39eca58ff3e8d048a6. 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/CA5KR2350135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06681d022d0c909456ee9f6d1cae26cdf5986150c974b9443c30a699cc1668f. 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/CA5KR2340988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86302bf2bdfc212b1c130e2263fea396fc0f801056930d6c36864772a410667. 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/CA5KR2329906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7dcaf31fdeb2f4c61e7f736e85036146943c4280d5bfa232e0a5d8a01ee026. 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/CA5KR2322182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c7807408116c6d5a152a08dc86ffe133aabb068296de6e7940a6d72fef1736e. 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/CA5KR2284986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82adeefe9321d68dc8bf9bc62eb405c4f632a14476f96d593b74b9f82af1ccf8. 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/TCAJP2533654.