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 0xc618d2a3e50ea3f22c44200258b2371e3f2c1926ac3427b91ad02ca866eb3f35. 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/50404678-b2ab-40f5-a841-ddca9365b6bf.json and https://artists.proofprofile.net/proofs/artist/50404678-b2ab-40f5-a841-ddca9365b6bf.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 0xe9449e9c9503eb9deea48a8c4cfb55c1ef11d986874025861d5fe903aa5ac918. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/GBKQU2337722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6bf8ab7dc40fb2b9fcfddbce893729a222df551bba4b089c58382531acadad. 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/GBLV62313925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03939fc7e17cd8d6f6e36d2c3793eee023f5e5cfa184a7ed63c28b89a34fdc27. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/GBLV62313926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67aa971785042de4f89e70d3d965a60b156555cb3be305be9f43405a5578b164. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBLV62313927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a3824e0013975f6239781600ceb40654862d535224b1c98ecda08c4093c7fd. 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/GBLV62313928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee254dbb4b520a663ccdccad0d500f64218cd0c75e20a70b9547e46994781fe0. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBLV62313929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aed95a40bb9da5b69e1516e3bb51a5153432e42f5deaeff41abc39c7d013801. 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/GBLV62313930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b8c09968050d47aebbc7b4cde94686d1783539dd52e34138b930d5045c1547. 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/GBLV62313931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a66b25292c1aae006c0416fcc2d774f95a8fff05d0aaa57b2c8ba8a79c2d19. 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/GBLV62313932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5c471bc391b13b9bd982ef14f5c8c96b9646cf1624ba53433457a6cbddb897. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/GBKQU2410203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d239e6ffefbc845631f0f5384dfdaef99dfa7ec76135603a3f7c2d4e4a7336. 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/GBKQU2419135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7786af95bf55f7dd7e3b8b71c1c90f9195c2df42a75ac1a10e313024aa379b95. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/GBKQU2419136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d000529d69a8afdfd99e025017c51d51b8d7719644e6d4b5cd517d5bb3dd6d0. 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/GBKQU2419137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115d9e37c17816a3322d4ebeb916d6eb815589822eb71340e3d24410dc93f43e. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GBKQU2461931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408b1ffd2fcd06397dd1ca9d9374ea700c2301123bb4fb456dfc43161fec6638. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/GBKQU2461933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1924a51e9ae72ab88065db15dd0f879571b91d971d4ed118a4ff92c4db865bc. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/GBKQU2461934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee3cd4476d8a9435a35758949739008ec544414a7f1fa5b9010f37b9e129756. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBLV62409428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f4a2266f6dd551eb7c4a0aee6819e3a2d7e41c85098807ecf673dec7946e58. 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/GBLV62400431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59ca2bb0b4dcc201899d3fa0c23ca88da7bb856dc8c36fb000f3a56c147e981. 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/GBKQU2383289.