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 0x8ed0a340fcfbade048965871ecfcc54d1532ed77417921965cfd0d19604c5ddc. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d404262-e8f2-4bae-b79c-9b12884a2cdb.json and https://artists.proofprofile.net/proofs/artist/2d404262-e8f2-4bae-b79c-9b12884a2cdb.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 0xefca6773fe85aec35224643bbdf3cc266e617bcf3a7733f7920bc56561ffbf72. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/AUKKZ2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1cdf59d24910800ab09be08447cf0229bda7705485a0578a548204e50eda61. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/AUKKZ2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1653380e223a90833114cd2c855291b8bf584e8d105cd172cc849ca983d1ef4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/AUKKZ2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa61233f75c2119acc77b21a4c7f8f330da4af0a29adfab84be86274f5a0fe4. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/AUKKZ2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6726303a0b50e625d5b27b1d39f709e1fcdeec54887a6dbdb6b0f3e1fd4dd4. 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/AUKKZ2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fd3ba0f7fd557f14cd41789ff3afc4593ac16e08b0f9fd7a9930e3d20d08b1. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/AUKKZ2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddc97dddfcfae4170052b94f3b6561a7c5bc58b4478881a8a4a6e36fbc1648b. 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/AUKKZ2000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906926d1713f34911ddfbfbf8527532d00537b86c1c556447b192a67af629867. 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/AUKKZ2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631672c8d06f746cf739bbb6bdb20092c6f5ed836a02f4f8f50fbbdd7418bbbd. 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/AUKKZ2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081208fda780ed0e3f8fb46fd3228f013412ac90f407d22ed8f0799911f1f26c. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/AUKKZ2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bc816a0ac4dc08c1ffbb6015cf34fbf1d50ad2180926cfc355af6a161a4cad. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/AUKKZ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc06e2e02cc3258f4336ad697c42439c764a6cfff1691b2df16299377ac7ebe6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/AUKKZ2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847081e45328de392c255d5ca9b30dac37faf37708d716203888c4d5a3a1174f. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/AUKKZ2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de0d2d4d0d9b62968b0888a46573594d91382d01a9c9adef41e1ab68aac59bc. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/AUKKZ2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fc5646bb3c4d65a196650c49a1032bbf173dc7e7c8818aef091c42afb963d9. 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/AUKKZ2500004.