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 0x21ff231e1a5ae9df001f1e716c7a8af9cebfd9a93c3d35ebd691ebc8808d6527. 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/34dfcb7c-fe48-4da9-b432-a8ba9c39b72c.json and https://artists.proofprofile.net/proofs/artist/34dfcb7c-fe48-4da9-b432-a8ba9c39b72c.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 0xf9bf6135d190206ec1fcabf7539e65708789d873d0f19aeeb37582ea470ad3be. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM6P41746820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c446d709702c350d35d361231701f377b7de6a1b5aeed588f16034f4fc0c7b2. 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/QM6P41746822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aba6f46701dcd810a62674fc05c0c93509d14befd30b65820da45cf9f2746de. 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/QM6P41746823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afe9c037883b452560b322c6835851b2729e6d18e1c8a10448d95c03a69c634. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QM6P41746824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78f9b65fe882a58681da5d52183fae9d9fa07c914237edac3b13bbd8a920ca1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6P41746826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d00ecfe85964fdf62e7652eb7c2a931af463270e1868dcfd05603d4c0a0530. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6P41746829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5745fd93865adab96533d7a5747bdcb3058a69d81b7c47f09cdbb1fd2b21e7. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/IL1041901141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d69cbc712b4435ee126d3b956fcf2b5a40246a53ec570d30ef834a5749756c. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/IL1041901143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f999324532e8a1bf02d14293a016bf5d8e7742a6dd4873c58944f3c78d22566. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/IL1042004231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74b67d7842efd554236ab8c1e16c11265198f5c3a5458036166fb449feaaa59. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/IL1042306902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046a3454cc77f9a51b7f1570f10c254ec89c211858c8b872c4b2f41adbc01739. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/IL1042103861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a1d14eadf8d95b66ffd745755cae748360aa6675b3f87b9079b19974de8059. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/IL1042501331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb8167efece8867413a8c7a8c8267ee1371fed146cf77813c1f176dad3051cf. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/IL1042505441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd365f09c7df83a6cfcc36f65130b241e72c20ce26ffa03a8af4ba38bf77b4123. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/IL1042505721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2292cb1e56869449a27f9317dea1eff46ac0c90e4133f053b741d16fa2e797bd. 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/IL5842030168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b52d09314fcd7e20051099effc9de904403c9242335b9f4db68b6218ed8690. 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/QT3FC2548519.