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 0x3baa03d5f037c1b2a81fd39cd037c3b17ef743d8fe849a3e6010bd2729711c93. 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/3b83b2b3-132d-48c5-bedd-11a0877eb450.json and https://artists.proofprofile.net/proofs/artist/3b83b2b3-132d-48c5-bedd-11a0877eb450.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 0x04d671e55b87c264d516581b5407dc421d9d392af4a311a93cc1d0f6e714b834. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/XX0000009010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0b93ecc473c12def9a26baaec9631e14ef2249c064ddd826adfcc874b3d4e0. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/XX0000009011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efb2635bc57d04a2a73e7a3a27a67dbdb047692543b6d2cd84a680e806990ff. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/XX0000009012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39807e96d1e63087c66f4d1a5fa7450f943cc952a01c5153f88b9424f7d85606. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:10:27Z), 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/XX0000009014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb56942d50532931b204a38b604d67c459019f5bcc376bf2bf3c10ed71e3ab7c1. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/XX0000009015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c429aa34f7034e4143f8cbb6352a7b02123302eaf5c6d57d1fc66db78198f9. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/XX0000009017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92d0b5ae360e77f6b8ff4f9237faaf557d91a56b5cb2114935751cac5230225e. 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/XX0000009018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00af1f1518b14b3362415ba4a9db04d9101b95cb07aa977345e75f85dc31c95a. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/XX0000009019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa879edb3ae16f91625bd99fcb73c0f34e7cfab366660fd7bc23e89f53139e09c. 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/XX0000009020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8430ffb91775f9182e3abb8064c3abd2abcd787018bb9f4f898f1b2585edb7cf. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/XX0000009021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a48580e9b19ef65222445e1e8e2d948118af1d39688753eab15857742003ef. 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/XX0000009022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4914982097802a0b8707379790c855eec82a7d15d4eafded4dbdedaa547cec. 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/XX0000009023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef24ae8573acd246c4a824d6a9f68ea3ce0e97027711f1d963844e620b830c4. Chain 2 (Bitcoin): anchored in block 957638 (2026-07-12T01:56:41Z), 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/XX0000009024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802f94f26c8d274c77e5ba527522300110ee58ae9bab254a79ff894211d41265. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/XX0000009025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2705b48b0e9c0eac956e1f162dc1fa4557ea6b6ca3f4b230d871590960645823. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/XX0000009026.