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 0x00661300a5014960a4df8952f6a66ad327288c2b3a1df15856b4a967e7fe7a41. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0db9e464-d62b-4a30-8e01-0055fef888c5.json and https://artists.proofprofile.net/proofs/artist/0db9e464-d62b-4a30-8e01-0055fef888c5.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 0xafcb39ae6d40a12418ffa2a204376397089f64a13e5d837cc35d54c0b8c7ba90. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZK6Q2071731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d57a7ad1faebc51e51fac3506cd0a7fde14df5228f12a02dec1e7e369bb85dc. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZK6P2020484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1793f6517dc65f297ba45c14c932596b4afb0197cc2f579fcad8795069c39119. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZTAS2180015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8079926fc646f936c16a9963f8c028864a1c3f053bbfbbe024404e26183134. 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/QZTB32240943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb586ccfd62bfac7c7fd68084749dbb65e60bff725f0cb7f223f10f6b125b56c. 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/QZTB32240944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f1482e9632127ef504932a301a9e67debdfd4624170fa9f1b1e497198f92a5. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZTB32240945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fda0dbcc3737ed656af2c0c1d52dca532da735bc88b41fc9bd755e4e41b0f5. 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/QZTB32240946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe939354c99689fbe42011b48b084f5fd4d18b68fd864c0a9e488fc7d40ebe7f2. 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/QZTB32240947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3728ad46712b550fc937e61b9d1aa814618655ba9f50f909a8c9fc92c6e31c0. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZTB32240948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d0fb292eedd49be82e199ca00d50fc758f21d4d7280ebe1be70345b6c8f9ea. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZTB32240949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf196e12a72883610ce57535f880b45d2eca00847d24f71ff1c9dfb8b15cc36d0. 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/QZTB32240950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6e4a7eab499bab364e3f1caf0e850d73818e9ba5af0737541bc0ab225477ae. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZTB32240951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a87f01589f000b68dd92a246579091ae0432d3d8f0aabea70034ab83d8aa4a. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZTB32240952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fed2a5bf2d874fe908960d83891bb881c7a46b0c4bb824fb024d75217f93094. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZTB32240953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda92fbed0a31d344361ad5e7d51d1759d05966c6f12ef6b67452d684be724a1d. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QZTB32240954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc379f7872fe11e8b72d01c4ae86389a57024a6b6fd63980c72295907ed292d69. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZTB32240955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce32ca62947218118680091f7296114b86084f72877978321cbce1d72ae9d7e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTB32240956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e48d51e5f0b4ed2cd96c679fecfc966cf1a42289625236d1d5c716b871c276. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZTB92320858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59bc65af13e6bd9dd22c47cae854d8e01ab89e1e7eaaac53ee5cea38c97a5853. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/QZZ772428714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356fa911e05b232422eebc46bb457416116f8a5c13df3a887f6f38525ca5dc53. 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/QZZ772428715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a7e37d2855472f2b3fad5b081bde6a2cefeeca19ac4b2a73d6f6a45c10e41c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZZ772428717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c88d3f3d701fc1edfd950a1b300aba99ee671e4d9ea1e91ad3c6729029d8c6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZZ7Q2560372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33dbc88a1e9ff71d21183749130cc9bf8c3846c6b010555af3d894cd34b29975. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZZ7Q2560373.