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 0x193cf1661d6a79245e2cca1207b0515062caac5803191a412b1196e48e6197cc. 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/809a8387-cb08-4acf-9fd3-d65ae6fe4d2f.json and https://artists.proofprofile.net/proofs/artist/809a8387-cb08-4acf-9fd3-d65ae6fe4d2f.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 0xbd5b3c8d3477b5f6e1f3382dc47555ec1ed1bd1a9f8d91924800d46349206169. Chain 2 (Bitcoin): anchored in block 957668 (2026-07-12T06:54:37Z), 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/QZ8LD1755916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf571de532036f4a69e0e2fd2a0107a2abc7825c61fe41d4750ed3cdb028a7ec. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QM2PV1789105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385343fc3673bb479967f696959575ee7f3b747aec622a66d736332da7947d15. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZ8LD1755917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0a43cd02a0cb60c10925d618989879caaf85f953a5df901cf8adc640349501. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZ8LD1755918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a19722e2ac4d8c9e1ba16a7f2ed97ee16cb1a5161e96125e3fcd4f87ebc912. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZHN82182055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f55805a78b30695c38ea9f12278d31d3b8a21f6c3f2caf86f3ab378c73c4a1b. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZES52194138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd646bbe716d692fead9c227da2f3c39be10f31eb743a26f7a664619dbb8dacfc. 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/QZHN82133388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b075b01cee447cba7b4e99268b4c1ac47d845d5f1ed6be8de11998447a70ac. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZHN82182057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ff25fe550fc2ea770d7f637559aab468b2f7a28a88db14573164e80f71e1143. Chain 2 (Bitcoin): anchored in block 957658 (2026-07-12T05:03:28Z), 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/QZFYX2127529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b710b85f4003d248d5886aeffc4d0796dfe89d3762a32ccb1045942c853cf9d. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN82182058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d453166cc7923dca69a700d7058518b96ea61ecbcfa31e4a3fdcc7ad1d3f8c7. Chain 2 (Bitcoin): anchored in block 957671 (2026-07-12T07:35:31Z), 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/QZK6Q1955989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66512c0aa3c580c09e7e6c640f13cf8ca3747781fad17ac3d6a848a7ec016b2. 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/QZNWR2164042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d67b064369eda50ad3a8e7c021e033f68a2ab968baf4ec91578f24e923828d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZHNC2354494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f404c8899ae98b11e2f9c7d1aa167f8de6200a7be8fcfa11d346e5288a1d3cc. Chain 2 (Bitcoin): anchored in block 958682 (2026-07-19T06:17:12Z), 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/QZK6G2354383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89dbd85c4f197dab359d06827bd6e823726b83b1b8e98a8d6e3123dffe9cf7e4. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZTB92321616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2dea1f4fa55ae0da791428a69412d140f17f8b00537b9ccfc9e6dca020f92f7. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QM6P42568787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e82fa5d0a4e7fc537e80945e894399b92a792134093cf068128a9dc3eade815. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QM4TX2503181.