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 0xf2b13a7fed7c7e78f204244a1ea2769bfe2a4763352f4f7b3695bbaf5b7d259d. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a9ce27c-1b06-463b-80cf-bd20fa3d68a9.json and https://artists.proofprofile.net/proofs/artist/3a9ce27c-1b06-463b-80cf-bd20fa3d68a9.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 0x99df0f174a2c9838bb7d36d8c7d8fed96adda3a0f44daa20896ea7e0fcb10822. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHN52413670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bbf34baf3adea4b469bd6d4621c42460f11b6e377ef76df3d49a5efc9a8a7a. 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/QZHN52413671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7207594a41e3d393ae2524f7464c799867607655a6de586a4e107de15d49fb10. 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/QZHN52413672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0eb35a142f10622e880b2fdf394337169e70fa16f537cf253e1cc69d9fc94ec. 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/QZHN52413673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe798fda2c3bc7fbf8bf5f95b86ab05ff1a10f6050036446a2d4e7e3dbc9c71e2. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZHN52413674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04ab204cf7976177b85cbacf670ba12f12d91e0bbcbd18412595fca495aa12e. 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/QZHN52413675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c0dd49888828e9bb7daed30da0aa56304980fd3b5fc9e5da7ff648388f7f68. 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/QZHN52413676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dcc731c5f6e67b0a7a57291a2fdb08825ea16d13609ab695e1e2458dfd8ea6d. 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/QZHN52413679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe727d7cfac037612425a0c264da4379b9e83d852a071d84bf43840fb33a9e2a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN52413680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf146af4965e762d67a1f6049f0d2722ac55579303c542532a894fd243e3e6f48. 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/QZHN52413681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2712a88e22def1d01ee585d6b2a3bd212fa97bea4a705e4e6e407501c3439e. 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/QZHN52413683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbab8f574667cce5de7d27298957a3b968d28b0b025ce8a81ef6680066f14d2e. 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/QZDA52114492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a66267e5b54d8ee30a2a7bd758332414ff450d2f4ce5f69e59bd936059ece96. 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/QZFZ61935564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df10b77d68f0a9348834bd6b6290322172251a6f1003ceb424b8d80046cc9c8. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZNWZ2110998.