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 0x972c7c843c73aff276110d2ac0d2e732287555203ef150f0208a2cf3801f9173. 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/82ef12a6-bfef-4e4b-ae9d-8275a9d80337.json and https://artists.proofprofile.net/proofs/artist/82ef12a6-bfef-4e4b-ae9d-8275a9d80337.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 0x81d9716c96742f6eaadec441335dea4c6d0feb1a4b5238149ea442b392c61c80. 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/QZTAU2250409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd633004d70c042bdbe8a273e16c6aa118ac76427c853b380ba9860b249d98542. 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/USANG2287316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9679d15bfa93877c6e63dcfcd3587ddb75489d84fbeec71a613cff2a9971a854. 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/QMFME2320190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf7571ace4ae3384a5d09d36f3fe4250f8c55707dd329f63908a8d5a84c778c. 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/QZMEP2485083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9460cfe765e3beef516c517726245af97b32b72b5f97e79fa6b9d39b89ac98. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QM6P42469487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803f0709072f2c26f3536197b71a85e92feb2cd4fa6840cdc1c96c806c5b6568. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/CA5KR2493904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53bcf1fae04285825c4855c42eb8ce252043b2c437f58f544b062cdde1605482. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZWFQ2443160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34c25ae1baf2d713b926c595d2eb26b93e69d021e8622c0d323149ba9ab4904. 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/QT3EZ2421683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282d86115ad1156b1ea12f28f798493931d0ce3633d9cd0ee0e573bd407bf363. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QT3EZ2421684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c23618a5d3aa318c974cb3003f0437b2ca7956bee643bcfd9742c7fddabd0bc. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QT3EZ2421687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43a6fa3cf522fa47eaa4fa57307544fcc47dfd14a7eec7835f99c7a1423ccc0. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZNWX2502954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f96f4efe2220bd4392746d699b99cb83e9ae9fdeb074befe2e660ebc41c1d3. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZZ792518939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f49c22fc73500e105bfbe51e3c6626b2aa7bba191b751638364f64ad5fb6023. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZZ792518942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8052b8718d0a9bdb546af32f51af074444fd8ea67c03e86e2274cb7299c38f. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZZ792518943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930f23c240878f4c58bebea6db9453070b13f6dfd36185200bb3fb163f6853d7. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QT3F72562992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51686597ea4b5f2debf1792384f7dfe5be275d901ceb50e1d13fe499adbfda75. 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/CA5KR2484359.