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 0x41086224153a429f32ee1d33d46e6870415c356b18874c2f288fa7b13fe438eb. 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/82e093c5-e231-4858-a55f-aa66ae60bd41.json and https://artists.proofprofile.net/proofs/artist/82e093c5-e231-4858-a55f-aa66ae60bd41.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 0x02360bb7e08d47399e0c9b50e8bbe4efcd498927809262ad9dbe3dfd851766e8. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/US7VG1627795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bf2248fcbd6d504ef84cff314360a3e3f79837f649437b89753b31efa9bf7f. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/US7VG1627800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bf2248fcbd6d504ef84cff314360a3e3f79837f649437b89753b31efa9bf7f. 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/US7VG1627800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d4c12a0a7e1bf9219133cf03d4badab326db8ce49c44d2f34becf8e40e460e. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/COVM11610002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d4c12a0a7e1bf9219133cf03d4badab326db8ce49c44d2f34becf8e40e460e. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/COVM11610002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd599f32287d0249ec5a7545588ac40dc72c2c65cbf836af5527a6dcb7883fade. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZHZ31995891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd599f32287d0249ec5a7545588ac40dc72c2c65cbf836af5527a6dcb7883fade. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHZ31995891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41e5f8c0e9ea3e909025d633f3b88c124b72c27a77ae10f5221285bab430eb4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHZ42078932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f505ea6aff3076ee323159947781bdd95589b99c7fe8826b5b37163900268bd. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FR2X42178987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc17bc3596dc89641fc5499b0b7492e051a90ebce2c5370b4ce9522ecbdb9ad. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZMZ92056308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10a3659a892726115818b99a26dbfa5cf7a0bdf01bade606b0e0bba8dd90949. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR2X42178985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41e5f8c0e9ea3e909025d633f3b88c124b72c27a77ae10f5221285bab430eb4. 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/QZHZ42078932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d367cebdc7a1fe6880631aad1a99ac198080eee0d3e872f29ff0fa2ff913c8d. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/FR96X2230657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe00032685ac508f4fc9fc96553896003ada65119d59c6e244d26124a2cd4bd. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/FR96X2230660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcd8bd42a9e239e785940138f864a2e133a981796800948636115c2f89ddc2f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0M2368457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e4f916551652d4bf372f84ff2f31e2c266f934dfa3da73295fe34af421393a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DGA0L2370345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa09fbb596f0c6211e973254a17b11405080553a0d2dbf575a185bde34327a7fd. 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/US7VG1779564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea25c82a633b0b4acf595d64742a2993dc4ea94db826e50f11a4d25d7f3334ec. 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/QZMZ92386360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888673c39604ba72d6f67abdc1643a918958213b2a952ee69cef81c19f2e9fe0. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZ5AB1622678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08317baf9dfb6f7eb882a32b1eff0fd46fc9db949c97e96d12b841493ae4abf3. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES71G1856280.