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 0xe48586c11a0dc7ed81c8de0f5ade7f4ee4caf6d573516cf7697c9738d0f5c8cb. 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/0394ff6c-91a0-4730-9fb9-a296c8c30631.json and https://artists.proofprofile.net/proofs/artist/0394ff6c-91a0-4730-9fb9-a296c8c30631.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 0xac1eb5cc18476d8398f46979204c0c1e42b2b623edbc1cfb699028adcd98e2b5. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZ7BJ1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69614e309b67cf9f2f83097e2c8d287b84ef6051c335192e75a9d00c38ee2b1a. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZ7BJ2000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48921cad4f72e0563fd34e5ca5c3dae3ced217b36010b26b8180d7bf1b564610. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZ7BJ2000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5247e923d3cebb858986bce01963493d00dd74f3e25d403ef7886f45a3e9eb2f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZ7BJ2000051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368181b2b9c6effc7df7db848f435023609e7f813389c51bccb2c4570f62c08f. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/QZ7BJ2100056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5dcd52065b685123c2013e90ec7e7cfa18f590d4ce0c8f1fe43c93715f4d1a. 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/TCAFR2171343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ecc88e74eeeb6f44d59f81e4bae8b5bfead66483a72e095e4a54876b48e6a8. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZ7BJ2200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4f56eb7229789aaa7ea8394c66d950d3f910eacdff9a907d6ad9792ddaf3a8. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZ7BJ2200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2ae5282b289a9bf18b723d38b3a22b3fbc9fcef146c78c98323558d2708d6a. 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/QZ7BJ2200074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4171af8de78098afdef25b6a64a05e0f4b8e2bb5daae4eb2846d78aa415dde64. 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/QZ7BJ2200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b624b27e385162fa4be8f70aa21f79ba8d0c1b8686e3cecb49e0d34a99bc9ac. 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/QZ7BJ2200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697431d11465f26e26acc4522dc8569d4cf8efaf210cee40aca4f502289fa730. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZ7BJ2500156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffbf0a52be23b7bfb8bbe566e17731ef5518834c380c29789fb47b7ecddc9f7. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US6QR2400156.