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 0xe8bfcb1b2d756f4f9064ef129e6bc1cecd9c88399b90db1cf8daab122600ddc8. 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/f30dbbea-0a62-4d37-a4e8-f76ba7cb270e.json and https://artists.proofprofile.net/proofs/artist/f30dbbea-0a62-4d37-a4e8-f76ba7cb270e.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 0xde0f16e8234c1cfac226c29c634d49295ae9b6e47c282f19e3512cf552a8d9cb. 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/FI3MD1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950b0d9c9853dc483893a0be43cd725b1a34a88e14274cb72ad01ae196089637. 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/FI3MD1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71617ceb982f25dd9b601d3a8f3682c0c5a61ef024806d21929b433cc123343b. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/FI3MD1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81addc6a48e2f8a10428281801882e44e9c13459bf07d92b8f1ea9f47b15096d. 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/FI3MD1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801f46024370540e0a0c4d6d98026ad6c6b16efa178608ce627ea7b5c4977330. 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/FI3MD1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2f94d4a91b2b81b88347d4a6e501586163140a538b86ab02449160262f8d04. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/FI3MD1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad561e0f5d8f2279dbaf6f5378b1d380c229547591b8f2d609965e41683a584c. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/FIWMA1700196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad3f6d718c7bd18b0dc2ccc3422408f9cdcb16af4c92df9fa801b5423f7f936. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/FIWMA1800334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf61ee6c50218258c12491c5c671e7199a90d52d6cb5d726ff6211662fa7e54. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FIWMA1900067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc380887ce806a0dfc6627bfb7e7a2560634025c86f3a00372542f34771f76308. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FIWMA1800177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd0d6316ceb6bc46e90ddccd7a2f407d08793a6d4c385d02a760c68fd0488f5. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/FIWMA1900081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ed6ddbd29d3e93a90b2e7445728a99bb65d0c5379c82952c13c2d1ba5a0c78. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/FIWMA1900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50ca05219ff7e1b1a323c8f9451f981f6bda9814aa00ff24547473128fdf536. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/FIWMA2200301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc548726e2e1c2aa3cee91c769ca3618dbf402d0a161823a5bc920d5d4f0a806c. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FIWMA2200336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c67ffb145330d46f9c61a167898999fd564099267facd4064fb9041c91b8bb6. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/FIWMA2200338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b36d9a4655a3d9f7c3628dbbd23f8599468beef573dcd86dfcf5abaf2db9c38. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FIWMA2200339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0334640fa71f02d51dfbc6132964e20fc3358b8233303a5ff6684cbb616ddb0. 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/FIWMA2200340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c0bcc705184bd07ef0560a6bd5b985091acc4676cd3572de92e02a6512c666. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FIWMA2200341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a3cbde3a26cb4a155df53aefef1c76c3108c6d2761fc1790f67a5f7c994250. 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/FIBCL2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c67ee0dd51ceb0072ac38554c0589d61c411ac9f109ca8c43207af69db41a2. 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/AUCJI2300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffa2dc1664a9a77a77b2f3f204bcc32c951c1e9141762ebb3b349eb95f990ea. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FIKHY2200068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10c125c6fc658c724deb1e7591b44ace8be69f63276f34578fc55e0e7ea9b79d. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/FIWMA1800248.