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 0xe73d659ec2d91eddf3e4d94eaa9fd827a7ee78a9ac27858947bda5845a16e775. 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/0c80ceea-c5c7-4e04-a647-071a5c0eae59.json and https://artists.proofprofile.net/proofs/artist/0c80ceea-c5c7-4e04-a647-071a5c0eae59.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 0xc8f02d86fa9ade96727c40528098ca40a382bc230c21da73acc021a17f00cba6. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/FRD9M2000360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8185a839a659c09e718b4c5f705b2bf9921d6503de12822f5f0351c7a34c82d7. 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/QZK6L2098694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45fb66d966c397ea64852fa557150acc05ef552dc2648a178c52922ebea9c1fe. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:11:08Z), 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/USUYG1414638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006ba40c2e6494dc70dc9dda93434970f46f6aa1c7ace3e7c625aab900745751. 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/USUYG1420020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7307020f4811b16c7c18094adda1f660911a5cf58f94026134fe0d2c9436bfe9. 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/USUYG1425340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd245898f8d3360cca118b7591432a3ae6857343abd569195224aacabdc1c470f. 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/USUYG1432275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4fa2aaee989dedf9c93b81aa980b5b6fa084ad26b1a2820d815606b41c33b6. 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/USUYG1438600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd92a2db2673401dc43e952bcea5495950ad5cc3323bb4440ca09469fd9fd840f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/USUYG1444256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648d8a28ab5b3a27d7d01ae2dbe6661e68efae46ed089005b1f9bc5b7888c541. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:59:50Z), 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/TCAHO2389417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b302a3ff6268628ae311da787ffd1a3bff96137aef5b625d432ede60baf514f. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZES52435307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6f5dc0bd1fe96973003cd7d2b5f2e892a4d09eb8b443223d46c7e9cfa7d011. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/QZFZ62472366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e568750843f675995e55a6f4f7dbebbbfdd923c38665b2c9bdb08346b094b4. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZWFR2322706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769fa7c178e2a4d425e03af67285ea046cbab8cb30a3c641ba21e3c8106f255b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:06:47Z), 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/QZMEP2435082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe956e2d69f78b0a7cb78e3f4b7083639c3d5011c41ec9ca80b818582fc8d28df. Chain 2 (Bitcoin): anchored in block 957561 (2026-07-11T11:41:29Z), 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/QZNWQ2400627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb275bdc6ca6095f7f6af0658b80ce91e3bb6534f4b9649f2081826553b4a24d8. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT4K52556212.