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 0x8fcdb8f410c3dc053ff95e38582233517742c51b4d97f0edceaf3c87071b167c. 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/3616280c-46db-4ce5-98c7-821b317055fc.json and https://artists.proofprofile.net/proofs/artist/3616280c-46db-4ce5-98c7-821b317055fc.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 0x9e02bfc8cc31f1c530f957aa6f54391897796ae0e3a549a6482e7c1f39d2127d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/CZUM72300475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b023030a9fd4b014edce5ffc91e2e4f8f89725fd540bcb0c72f5d61688f8a3d. 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/CZUM72300476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dae665b1619ea44d1c51f235174479dc47a64c032aaebd7ab9c5d3136b295b0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZUM72300477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecd62516372d803477e77746112a3a53f9ca4551c4ee71673f95e0c159c4b49. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/CZUM72300478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864df2471cf3b7b3e1f974d35a9dc3429055aa6a41187c5ff6a6402422ee2b57. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZUM72300479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b4c75861c751ade0bab419305d0ac5a5697f17cc0b8196c774a6000f706559. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CZUM72300437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf82eaca7e54e42b3122b076995a68cf9fdcce909b8d58ac962a058af860bfbb4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZUM72200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d5f4c84d7ddaf12f2071b754a4851fe247ce1857c2104aac784b1bf41c786e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/CZUM72300480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d78e998cdc2b9016d345b55fc11b50b81d702177734df849c0b93894f05f5d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CZUM72300481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37b841852b8bd5d4b65c5a62c33d4bf403b6974abacd1d5fb2ebb675479ee4a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CZUM72400277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe463b2a3b3677721ad611ca6e9d7a0be332e2b5d1f8baa8890cad35951377038. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/CZUM72400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a3b2bae97b47abdf33b9742bb4309438ebe75dc1208330dd8def9155d469f0. 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/CZUM72400278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec910e5587c2fd922f1d53a595b3db9bb79f0c2815bbbafca07456f4461de165. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZUM72400279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf275b3f34602c532b539d2619690d29ffc0f51d8a8fd845c2eafa6442300cfc5. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/CZUM72400280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11a000031170fbe863343eed0c7f2180576216282f5472b90d54b1cdc2a24f5. 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/CZUM72000722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11a000031170fbe863343eed0c7f2180576216282f5472b90d54b1cdc2a24f5. 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/CZUM72000722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x558db2d02e8662ea148b157be0a09c524dfedd05613d86d2a20a398f36d6e2e8. 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/SKP592100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ea816760de2434c3df547ce9c0476235fde486c4057c5ca62e7c1414a3ea244. 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/QZPLS2160155.