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 0x27f28f13d74bb41065e00a6be959c61dededced179b7f9ce6cca57c46f09621c. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/75183dc1-d3fb-4a3a-bbf5-2e1f5d71e680.json and https://artists.proofprofile.net/proofs/artist/75183dc1-d3fb-4a3a-bbf5-2e1f5d71e680.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 0xf1f7aff03dc6b006b53c82b1eb9d8d115ee97537f8ea87c31ffcb3a3830cd593. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBLFP2560229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f8fbfeca3309d8b74ad3c8867e4b163f3f02ee21eca083163aecc9431726ab. 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/GBMA22517888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddafa6e50616cac90fa47de5940cbdc4461b91366e29cfae640a5bf3521bab81. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/GBMA22517890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c18efbecaa34c34424958eddefcfacca6bd061711d6052a56797ea612498920. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/GBMA22532907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e303858cf80e3610342d9b223443a370b3136be0974a7842a711ae09bad8de. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/GBMA22532905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e859c9f4a3344ff2de3e9e2199e12d4edd6eb0bc753caa7ec7c6c4e0341fade. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBMA22556331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8be4112ac1066a18aecb3e9aed629f791522528b6bd29c4435ee831bb8a129a. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GBMA22556328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2421dc8b7cef9ee6fd8ab53cbd5569070f7601a67229ab0458e44717579a3247. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBMA22556310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1df20260b0d39fdd7a9a4f9d0479453f1359f4f2173dfee9fb20f2f81418ea. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GX53U2518499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72116f8b73d93e42e68b0d2fca3537b38ebc097aa26736c3d2ee7684154dda65. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GX53U2544309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d931830b45781196fd7b3c31bfbeb54ffca81446dd16d97a8285feccf1fb66. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GX53U2544340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe99f62b69409ea48e3443b61efc72984f2f67222a073e36d8805db4d224c82. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GX53U2544327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe41f5d20f8553f76dfb4068a0a67ede52259944a9f7bc3e1cc7c7d98caf992. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GX53U2544323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x768499ee1c545b9b42112de80331459b6072f32e9bd4bb362c77f41d58b2e5f4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/GXH2J2554171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b0ab66768249eb02af691d622fcbe04968686058e9550cec560ebf55b39067. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GXH2J2554172.