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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b54ce8838e9ca158f7650d4bb67d1844a9a8eda7d178a5eab6e1736ec880f5e. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03a9ac30-df75-4ba6-ade6-a5f236c04eeb.json and https://artists.proofprofile.net/proofs/artist/03a9ac30-df75-4ba6-ade6-a5f236c04eeb.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f840431d3a4ff9c6817931acc93e11d75be02f9ab1421c3c208372449232eb. 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/CZK322200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3353292f4c5e4ab00259aceabc03b8ea4225e81ef607e38913b1bb0e9010f45e. 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/CZK322200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8159eba06e6f98f8ddd1ba36e05b6a5ef83140ba35dab690a1b5480ea7a12835. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CZK322200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccb4746551bc70cdea1f0b13915c3a28da0b78b29142fdb13603f94ede3c472. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CZK322200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ef8db950ac59a95e89895878fdd2d9f1b9b8a8c00429589fc8a47b052176e1. 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/CZK322200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5c256e2994ff234f4e80805044f72063666c77d581ca681ec96961999aa9e7. 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/CZK322200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc10b5a9bb99bc0ee9887833090646ade824a647ea9276ff26ce24711faa941. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CZK802100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d5b9ce34d2b96b661b2204804d53248b772a2be89c0200d73c8acdf02149d5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CZK802100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36183ab41f08ba3d65a56bdd13ed5a3ef0d1cdae1c06df458dffc4b2fb837937. 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/CZK802100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d0e56a297ba58a307680664def60809dc0f4e5307941b0af7604b3f95f95b6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:26:40Z), 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/CZK802100019.
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 0x55857895ff79d4c507136d7f2369ebd0c3e8a13cb5056df95e7aa61c3ca4ad8b. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CZK322200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb480b9a99b3c70a130aecae9b9d1bb62c9967c489b08c0e8e0598c9beb09936. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/CZK322200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a245dc4ecd2fb1fc66111c5746d8ef71e898b053240b9c0125f6c5922818bd. 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/CZK322200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92883418aa944fb7746dcc83cd18e001030fca81536e69db48f409d01bac16e9. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CZK322200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48deaf42a17407e76d308f9b4fade5b827092937d0173803742c9801afad01cf. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/CZK322200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5c4f54e8cee1870737f7406775709db1de16a4b6d4b96fd79dd61d8018dc54. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/CZK802100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e00fbf7c7f0fb67d46174660bbd960fadc1b99443229625037af1fcdd5a6cf3. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CZK802100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b2b73b8988fa47c43d8651c90545777e656c88fa68d979047eca35b44e927e. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/CZK802100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab77950d254d532bbb4c6539bf5de3bc42365f4b1a6de193455d09ed4da6e737. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/CZK802100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dd3684a45e29a7b78ec1c6815f52bacb49384dfb29121e32597e44614602f1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CZK802100024.