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 0xfe30f48fa77793760ad8b31dfdc33d6a559bed792dbae073068b26fbcaa732bb. 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/d15de647-664f-4333-a7b3-7e3cbadb2706.json and https://artists.proofprofile.net/proofs/artist/d15de647-664f-4333-a7b3-7e3cbadb2706.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 0xf9593bc379d184ff197e4ed102343c686f0c6bb17603fbefe1952a0501f711d6. 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/USJ3V1128936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f4a05a45b50bf1a9f7afbca40e7b1bdd304c074d7f97cceb3c14cb53002fe19. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/USJ3V1128939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed303ecbc821aaec3fa7b2affb6aaa1768d1f6c53aaeca51d26815d35720be2a. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USJ3V1128940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d18319f89cc263f0a380f6dac271029be70fb42bb7b5579e7cee51d17c9c8ab. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/USJ3V1128792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dc81ca01498eb59e3864b976a1f01a3ebf1d9026b309e6513c739b5ff14535. 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/VNA0M1826215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf68577c4c10e69bb09a80bfc05d68eadc39b53fc2b80e4cb9b928c5c050a41b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/VNA0M1826223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dc81ca01498eb59e3864b976a1f01a3ebf1d9026b309e6513c739b5ff14535. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/VNA0M1826215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf68577c4c10e69bb09a80bfc05d68eadc39b53fc2b80e4cb9b928c5c050a41b. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/VNA0M1826223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70f22ac83c0cd2c406e0f85c39a66bfe689c541db0ac15681b61a9fc945d654. 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/VNA0M1826303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe082e0363553ecb93bbd35f0f618bdedf06907e8a69ce4c003b55d993ad1f0f. 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/VNA0M1826245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x443acc23e176fa83ca26a893da3f2cffd85e94912874b4a4c5d245fc45e87f3c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/VNA0F2308798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9598900e79eeef36f45b2a78d532f2f42df17f7fa2138a4600aee483d441b45f. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/VNA0M1833101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5def5b9f98b0ea319c5ac7cf9262f54c261a35dc50b5da6abced10d9c9b0c6. 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/VNA0M1833107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7847b7ffe40f4c4aff9c6957e69f6629dca5b84b233a88d0ca42f12542e0205f. 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/QM48F0944404.