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 0x80a875d695e5b57cf0492a62a13df7e896261836bc51240f15f695ec90f2c7d2. 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/3bed38d9-401b-4a7d-9732-fa472bcb7fce.json and https://artists.proofprofile.net/proofs/artist/3bed38d9-401b-4a7d-9732-fa472bcb7fce.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 0xdf8306f1a6988ca2facb5fabdaa04bcaee3743e3072a5039c93e2cb5e2b1ab94. 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/DEQ121751811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624a550385771a05b550f108098fa83da49867454e250f2db2f6c7bc0312058b. 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/DEQ121751812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf062f82985b9573116a9770bbedb5869a7db039abab9fcd4c13dd17ed00e3b4e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEQ121751813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61b4e1de0e6435becda37332cb3f9de5bb0d15d542eb5c076f64c024f5b89e05. 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/DEQ121751814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bafd85628ee9bb6742b700f79f104d6712b6bd28d31b2632820d3b5d1addd6. 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/DEQ121751815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb44cc2b9e2ade039b9fae2f5075d7ccfd9c30fb82307b9348348a4bb3ef688. 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/DEQ121751816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0430c5c56eb5124f14e4afaf8a28173c71bb8aa7c1f33fdd33629b4caf0cd10a. 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/DEQ121751817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92f454eb0c0bda07bb9d7158633e2078421f70166d2561850dc0d458fc6caec. 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/DEQ121751818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36ca3645894d62c989f2cdb5ca8f341f3af78f502d4fd5466c6d183d205b189. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEQ121746895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69be07c2e2937708231e06b7ac7aa24dcce98beb994ebcf65277f74904004b53. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DEQ121746897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de8e8e60b0a973e23b07b2c596b44f266d3477905decdbaa2a823e019723499. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/DEQ121746899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d6ff7e50633bc533086a8398eca954c6feaa5ab8e0afeb621dcf99512b5b715. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CH6540899405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d5c12f886593064d28dd407bc52c1b6af013c7af24f99e55b34221ec9cfd0c. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/CH6540899406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be87a699e73921874cc9c9271cf686e685241aa77cf127c942684f6df573efa. 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/CH6540899407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcc5a0a977c0d6e5fe02e597b8fd8e931ada63e9de980c004048dddbb318bd9. 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/CH6540899401.