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 0xeb0896b81c147a2bd483650b0ec5d04601d6bd1ed0b662dd70365b8ae2e45fbc. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d6f23a6-25b7-4b74-81f8-254415eaf7cf.json and https://artists.proofprofile.net/proofs/artist/5d6f23a6-25b7-4b74-81f8-254415eaf7cf.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 0x01bf419b0b0302396c75614b7db78d9dd2bf6846483de04088672cf07e140261. 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/TCAEH1938596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6f276213e5fb536085ba92148f4820ca02710ad1e7628ef0e5a78ef72e6900. 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/TCAEH1938597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ad421c39d6b65d8eefa12d107c40869d7830a29f7af9abdf6d5ef280d75c5e. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/TCAEH1938598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a29102da4df90597d4fcaa89da622aec41276a0183ac9429bf247760d87d451. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/TCAEH1938599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd1300983efa9b2ce4cd2201037d3c0f630519d17b0de834f4e18acaddc6c00. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAEH1938600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a65927a3eb2debb8670cd8ae336155714da6b26f9ba9e68c16a227c0f9236e. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/TCAEH1938601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b672df7872980d10205b57685638a53673eeae7c14656d33fcac94bfd23c2d9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCAEH1938602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70fa0be161423b5236cd13b39ba955c88739e08e59aa408a2f8e059f4c55dd7e. 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/TCAEH1938603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f4d0bd1ab39807351202b47234911cfd57489d82c70cf4c16b56aa0c2a92e1. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TCAEH1938604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890c0890401219dddea9f2cf60bc1cfd0d035f8d5da7084794fb20a3d8739efa. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCAEH1938605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068e96c6908bd70f044350e8b9acea2b31468418a2a2ee93b1b2e7d603012ebe. 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/TCAEH1938607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca19a0515d97b34919821ddc030be140cb3f5647d68dc14f0875b7cc5a12941e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAEH1938608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8226739af42b9e421dee02ae562dacc6c03c191b8909d593ba5d557c19c0fa77. 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/TCAEH1938609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d4bf0788cae6283144c4296fb1a64fd769917990798aa1bb38e8b54a0a07e6. 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/TCAEH1938610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17615ce8cafcca0afdc53706608786db994910378ad3398eab4465bea3c8829b. 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/TCAEH1938611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38ff2dbbc18612d1b2edfbcbb5a3a4f6f02ac29ac232e33dec2610aa05ab70f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAEH1938612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f189ae4abd9498ccab8e4dcf71050f11523c020e095be29a707f33e4dc3b4a1. 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/TCAEH1938613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703b8c7ee6c0940502c62babd58c22969b438c054e3aa64d88bdb0cb1631b7d8. 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/TCAEH1938614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcab2d683a5418b0b282c9f228e4d96c092a21a7f91ead46c64c7d4ec670e011. 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/TCAEH1938615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1cb9b57a1fabe790d003e17714e0169cf7e6ee107d539b2c792d44f662a9d4. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/TCAEH1938616.