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 0x4744cb10adb25c8fea3b70755ee91f3625ba84382588c57d71b94ee43289b20f. 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/3b398cd7-f16b-4cd0-8c94-86e27dd9ece3.json and https://artists.proofprofile.net/proofs/artist/3b398cd7-f16b-4cd0-8c94-86e27dd9ece3.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 0x96a25ac8bb2a3c13e41953f0dffa63dd2950e2c107b05c8fd42ef0d13adce5ea. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBKQU2295351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464eaff9023f3f55ea2ab92ade8ad61905095e95afad0c69566deebcf4c0dcfe. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBKQU2142578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de28f1ec8deb43db316249c9db8d84469a4cec4b9e4580b7cb94cc9d2df9047. 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/NLS241600592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000cd497dc0ef8b8884d07e18b6732af326a80727c61ff9373075d57d18160ca. 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/NLS761000508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b470adfb42c25bfba22fce110784273374707cc12ec871a90d8c55e341ad68e. 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/GBKQU2512163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a232da3e6a49d559e0f99edd14fb72f3c06d2b404b720e46f2a6b6a9ce72c4. 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/GBLV62410233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49fc44b54fe752ab5e65a87e952245018dd26c1cd3d4fe17598042cbb519190. 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/GBKQU2464257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa70cd418e6a4a63c48264bf330e8c6815897f095073361d1f1d79e5a8f8b3050. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBKQU2430073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd83758e840369195f2d05972a81388391edaabfe79a6cda85278f4e8d7d674e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBKQU2425102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ae1459afd1d87fa076135d52e3e86b6872cf5a0fd30bd34055d00152d777b4. 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/GBKQU2363042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b86717d4c382b36989da6f436b2863b05fa01aef8589361f4657a3d01f68b9. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBKQU2339573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddf26d4e0adfcfd394e3c498dec43abd34649c30eb04bc59bd998084287b4cd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBKQU2304667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1161b5e4b6014d6e36c10089b6b7deef53abc19a49a6ee8190d2069fd714d95. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/GBKQU2292262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3515737010c27a7382751f9ff6f0ce8f33b3cd924e637711c301f8caf21e4744. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FXQ692200251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08d825a66e3c4d178cc7a56bd86bac36db4b6ffbcbfc47bee10cc57b299be99. 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/SKC832042002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb630659da51f5c0b6d2401c6e3b603e768f5a84bb60ad52ef7d9e8938fcf0d5d. 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/GBKQU2032681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7be5d2caa4ae0f507308d320d86d4b4b27af40f92ed03048fef2513d8906536. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/GBKQU1888189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce07b8334f8e90ab93eeaf7e62ec2094d32b469d34e6bb59062a503807391f4b. 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/AU9G31507701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904f9f4097cb2932fdbdefc63ef72fe75206bb8219a7f870e5c2199232dc3526. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/AU9G31507702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bc80a6f009455df9aa5dd318b1e71ecccfcb1a88e7aca1e92cc620759e2b5c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLS761100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657f057c753023715b31508a4054b56098a48dd1842ef7aa9135b43d0743e7b0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLS761100073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29711accf59487235e7be7121e52dd4b24b49a35df9d965a64c72400c92193e6. 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/NLS761000501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594233ef344b7ea42e7c070e3d169a36211a34a6ce46fe68dbd8795175ff6063. 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/NLDD60900095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de28f1ec8deb43db316249c9db8d84469a4cec4b9e4580b7cb94cc9d2df9047. 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/NLS241600592.