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 0xd56718d1127c095c831d7bb29fd8adf4d664c164a905d54758cfd9bc16bdf382. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/65605edd-7aad-4d8d-be12-d5c7f4a032d1.json and https://artists.proofprofile.net/proofs/artist/65605edd-7aad-4d8d-be12-d5c7f4a032d1.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 0x78caa61b181746b854f013495ba85c56e6452f34acfe8680e7944d313968b25e. 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/QZS652339726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e0f5e7fa3e02f5a5c5bd01bb60b65c11a0a15dac5614a724e81533e689f02f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZS642381405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d66fe53885145b24129131066160b6cae15c61f037e43d3ee8dddfdb48773da. 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/QZMHM2310031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11d95c63e4aeb7dea9852d22453c2ea8aa73144cdb6f3a93a3e306f623af728. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMHL2389408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bec6287de767975d57e7abaf254da7bfc7f6892662f7d681d191ca6387b53d4. Chain 2 (Bitcoin): anchored in block 957198 (2026-07-08T15:54:54Z), 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/QZS652395276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee2c0bed4a5979e1e1571705fa709cf425de874c8f54a70ccc5fe38f7bfdcf8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZMHP2312987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee15afeff252c6f11d0743a3df9829fec51e00bb8be460192071e0ba938a2020. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWV32463617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc21d01ffecf0ddf3249a802b53bf25c4fcbb862537c3f6638e8dcf36f11a415. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZWV32475768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb733989e686af841c8767f12917873ac4a8753d72b57e1beb4f1259cad40dd03. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZWV32475770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x449e997be0c293e7a95ce1bda609bd6b55f3ca2111ad644bc94e98760250a271. 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/QZZEB2482458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec62eb409b142ab94bc6dc8c7661379fe10fd490bb73718dee5a781eb591ba2c. 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/QZZEB2482461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dab8cd03b4a95139ff97f4c1926fdc4f64719cf035cf8f2b9db2af1aff2eea0. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/QZZ8A2545583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d96ee74d1ca4b01c5758312beae56c6b386598ec7471cefd0e4ce116237e94. 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/QZS662476144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f9b0813a42e094e4494a2b44fa62fa0497460eff99d0afdd43e3f9227c57eb. 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/TCJPG2576340.