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 0xd40dfcdc59089b94d2b83581c66feff4c06f0125408529510755c9c8fcc622c3. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5dc3f7e6-0273-4b8f-b18f-0adb1ad876e2.json and https://artists.proofprofile.net/proofs/artist/5dc3f7e6-0273-4b8f-b18f-0adb1ad876e2.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 0x47233c058fa7c551e04220b9ee8da2fdbba863d6292133b99f12047abbfff3b8. 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/QMK851200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b65bf6fcf0b52dbcc16d6a6f3000eea9ceb8a7305b5e0e5f9aa995fae5bf29. 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/QMK851200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab283834d2d29a06dc13755862f1c761485258fdd4c4b6e94bdb2a374967380e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QMK851200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a68aa2de2d8ef3c25cccb0f665b15c2c0a7a77780760942ef187c198438d22. 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/QMK851200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc395c86aaf304de049af7cff8025858cf0ae4140645082a2892e71f25fd31213. 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/QMK851200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58440b077d5ed0b5bdec68074016ee942c53f695cd44e58eb6d9b77162f239de. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QMK851200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2611b3e4acab4c92e4e89eacafcfadf9cf29c8ed0da50e90b81e0e5877923168. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QMK851200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc641272135813526c7d749f234be536617d41af0ef4d219811eccbb0bf4d9f0. 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/QMK851200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999815f44a48fa32cab05fef539668ca35f78acc00c77ffa9e720b26b454b71f. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QMK851200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fc793abe70c83b521a1aef2e21ba96f236f4227ad762f257cf3dd375044673. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/USDY42320834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792a12b21e542544f8142b83408eb588964d65d0c6631615280a7accc0ab8929. 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/USHM22232604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88185deea0599692f8c73165b7adf470191f3d4b090122ac45394565ccda102b. 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/USHM92278105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdedde0a0f143dbe79bfc1238322bb049defc6e9da134791c5af95590d82d2381. 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/USMH92352767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5c9eba8be603d60b1665b6583f333172bd9c6339127f45f363481b26925343. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USMH92352768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fc793abe70c83b521a1aef2e21ba96f236f4227ad762f257cf3dd375044673. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USDY42320834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88185deea0599692f8c73165b7adf470191f3d4b090122ac45394565ccda102b. 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/USHM92278105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5677ffc2f9d20bc759571da58287958b9cfbf2c69f59e6a2e88db2aaec215845. 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/QZ6Q61600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea2ad67cd9c9894abe27fdc9d60029bbae7137bb9a5da2800d396d3f6a788e7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ6Q61600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73f4aa06a9fb1f662d2e98d1dc93f569e92a114ae200dcb32e5ea1b43e91eb7. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZ6Q61600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1039cb8bc390afa76053aa4a163ec71a5bdc5daf583bc4e2310b8030fdcc40. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZ6Q61600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49fbe2ba289e50b4bc612099ba276a337f330860628d390b8ca1226b95800b57. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USHM91682199.