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 0xef7ffdf996f744f11b04bdc60182c903d1b04906a58ac5f5c71ab87a186e2d8e. 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/c928a599-1a46-4b62-99f8-d686e21ae7dc.json and https://artists.proofprofile.net/proofs/artist/c928a599-1a46-4b62-99f8-d686e21ae7dc.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 0xfc768562bb974d0810990d92ab4c4251989dd27b704cb8ae8e00a7a239e2b00e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZAKB2324400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a0f2a3343be196e9c006c0ec72d508f34ed22f813b83048e45d864687bd05e3. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:09:31Z), 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/QZAKB2323855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e07f379f54a420bdc42346f7207bd80624c2d7b8b60926b50337278b4e7ef74. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZAKB2324403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3be7e968812193ef2663095c715687be00c2acb441d8319cb5de39f828d8bc6. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZAKB2324404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222f4dd8bc1e90d32ed1a1c57e6c0acb635c5931a72177162092df079540f13f. 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/QZAKB2318762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644bd10bde4af0cde1d58f74622b039894ceca315316934c5bd74e2fac1b8460. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZAKB2324405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3344b67d54c1a6b47b6c040eca9562def5de02ae416a24ca2186a2f1f765304b. 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/QZAKB2324406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe331f0f120de6998d693283229f6ec9ef13abf8a01ea81dc994e3ba4d6b87f3. 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/QZAKB2324407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c90fc52c3a10212c4c83cf1a3eec83c2eb16941c512aeb1f9d0464b8238daf2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QMFME2350110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59e9327f4488c9e4cbe3d9cba07ebc33518e66ccf20d5f10814324a6334a76d. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QMFME2354950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0be1119b38749aeb6d58ed23ab43c04405aba377c7707c3a5a786281ff42598. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T17:58:22Z), 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/QMFME2321486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587149d41842505c5cd46e4a14f55b8da359a3bb08893c6688f2e95a00e7462c. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QMFME2354949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226ecc48b210a00f8093dacab7f944089295f8ba06d8c754bc5633dd4dc123fd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMFME2354951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9229d849539ecfde0ab0cb5253f362cadfd3b0f98414bf6119ada463f9243d. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QMFME2354952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe614a2629efdccaa6d7e7c7fa4eae4cc408314ba05615051d41af481db9e56f8. 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/QMFME2354953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364caac955f0a0076f7c38c2b4354dd05c159e1c16a9a842d042788fbc92fcbc. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMFME2354954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538f03166ef3828f7d863a5ec90ca549a233278dbeddecdb522b830f2268cc53. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QMFME2354958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4493dad178470f4794677289d592ece2f4d1885fce50050ca95995616573d0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4TW2478339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d22855ede2e019cb999fc3f3b19d0de391671562a2c9a19e880aeb9b235683c. 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/QM4TW2478346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a47bb2fef07417102d1d098aa6263d8ff7403c7d318261aaa9100d217d1448a. 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/QM4TW2478348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e41918c0d9385c97433019e80eb090186a3950d9b3e12c0be5146889d1ad6f2. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA72454777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e41918c0d9385c97433019e80eb090186a3950d9b3e12c0be5146889d1ad6f2. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QMDA72454777.