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 0x423b55d0ca63ddc19fac06d559fae4f89b6b79776a8bc4094323d2d25de9e988. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e6a582a-dc93-4a1b-8675-ac8220c51a88.json and https://artists.proofprofile.net/proofs/artist/1e6a582a-dc93-4a1b-8675-ac8220c51a88.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 0x6f632158dabf243bc0f9b6662bcf8a4d64e75eda458edb92700de4e6e997a691. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZMEQ2244164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5491ce08b402a3a7b36cf5341e96f5e238e428793141494cad8c523e45665056. 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/QZHN72342578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f632158dabf243bc0f9b6662bcf8a4d64e75eda458edb92700de4e6e997a691. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZMEQ2244164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe576bf5bd38a34e2bb6204b421eecd7b7a7faf985ea199474af58686c79f6b4c. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZHNC2346541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d3c8908bcd165e35d64130e9f8ce991038fc3f3f77c7d9bb3ad83956ab0f2e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHNC2348982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef6de210e2f56e0e3df028bcbb2938efbddfdc4396d368a164c3ad986a6bcb1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBA2344697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a443df9d36cb373b5ee1662ac3ca3d7121035f7d7a0abaf9bfc6b3dc4f2a6d1. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZPLR2349462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6acf4c2fb7c24305fc475db961682db403ad178b04e4c11512d928b92ea4302. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZTAX2335876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba32b7901bca794eb4f203d501ded5046e3028873e4ffdbf48641b02889e76e. 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/QZTBA2338984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a026462983c8e88b1c2e52b2bb63ddad026a164a826f9de10a0ddb10a652ebc. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZNWU2400494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62df93b162507b3043d371fb0db89c0a1bf2046ae57dff49e7ddaebc7007e8c2. 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/QZTAX2465684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4c32bd41ffd4e03796607fe9564fdace45777e8ea4ea91055fdc7810f4e227. 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/QZFZ72570370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec22aaa5830f2aca9ac5391d7b43ef32da35f408da673ef3d4daf4fe275616e. 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/QZFZ72576444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c12de2ef0e3e14c562b1a75f756d84d9bc7c86ce71db3068b0b3e46f9a13846. 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/QZFZ72572182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474357426bb63dcc4eda34ac79907392664c895cc04af8cd65820d612eaecda8. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZFZ72572183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7b8dd88b056959eb9ebef78618cd3a9bb7b9723ebfa3347c8cfc20ec62f738. 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/QZFZ72577773.