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 0x0b557fc154bc4671bd3a29e7d5fac309a44a7f2820f61983aa199f9a7c26646d. 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/808793b4-ddc3-46af-b085-103fccb8177b.json and https://artists.proofprofile.net/proofs/artist/808793b4-ddc3-46af-b085-103fccb8177b.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 0xab3b1e627f41bae3b45d688f10cd6d98f61d018e0304bc2a618c8a5d4ad68689. 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/ES71G2407700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f2c5229d423a629ccf3c08f4543441931c3404a2a93e349de14190e9cdd9f8. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/ES71G2407701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8c792144f188b869986f36b52669c5d0d2d053e3fb60a3ae860012c0f5079e. 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/ES71G2407702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb814bee8f757766e24b108396be3f7af211e2fee9cb1f7320305363310b2b4ce. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/ES71G2407704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc16807a9102a2ee9ddf71ac6f420182f9d8e94bbfc2334061632797cde9ff2. 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/ES71G2407705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbad40f65d76afd92c060af285d0077a22465c49156ebaba6c24b7c8ec1f60c9. 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/ES71G2407706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f71556c4c6a7566aa39c70a3fc7e3c1df70e2d7c831c2150d08c928dbc9cd9e. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/ES71G2407707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76c9c47ef56ec302e6de4aebb1cb4c28a6089385a9e0dddcb02023c425455fa. 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/ES71G2407708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc448c53497d32f283a5a88435d221b1bf06f7f2d8febe854955cf8ceabe5e1b. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/ES71G2407725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8093a5a3af304141d0abc1a109beb832d55f7f428efc4e60ee7c58a7e7947e41. 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/ES71G2407724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe064c392079ff22418dc9536f48976d5e9cfc65f4891b7bf48803303f95483dc. 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/ES71G2407726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae6b7a1f56302a6c749ecf5c6859f2f35365f33a0416bfd9251e41ea750f7e6. 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/ES71G2407727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd7e5d45fb60eafa3c44d3d8dfa5412a90fbc05eedf9aa749d57ae40236796a. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/ES71G2407729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf688dd3eef536848e46e6b1fced1e063adfe54cf50b40ae12b71c25d330396. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/ES71G2407713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4b5c65f8aa4897b3ae2a8b4e99b22385cfc91c53ad126ed2eef5abfa710768. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/ES71G2407718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea750e82f0415628e20f1c7b2e170754f15fad5e725238d5680c9b4468568d27. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/ES71G2407719.