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 0x37e9e03c55567d999c16c59272f234766574b4db05de5f7232827d64f554f479. 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/66c2b258-3e3c-4f16-bb68-c2f030943b32.json and https://artists.proofprofile.net/proofs/artist/66c2b258-3e3c-4f16-bb68-c2f030943b32.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 0xdb1589470bb9a3ae1f287cf493d9e5939a2045397a0f32419992c05f26444540. 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/USX9P1220246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1589470bb9a3ae1f287cf493d9e5939a2045397a0f32419992c05f26444540. 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/USX9P1220246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc86d75f622b33071eb4ab6ce7110868d370bbcaa24c245ae1e0dc692685e37. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/USCGJ1659632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b25736d4701eb3b7538b82f0e8710a4e452d7b8fd421079f3a93c4cefd77b66. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/UKMSJ2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12ccece93b769ba18f4d72ef2580e64c8300519bdbbb2ad702c2c095e5351a. 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/UKMSJ2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26c2db3a8b20dc3f9db288fd15935caf4313e40dec66e27f9574bab95403c2c. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/UKMSJ2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b25736d4701eb3b7538b82f0e8710a4e452d7b8fd421079f3a93c4cefd77b66. 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/UKMSJ2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3457dc064ed32a35ef961491e8cdaad82e4267450e4d6cb164dffc5de359a383. 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/UKMSJ2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b12ccece93b769ba18f4d72ef2580e64c8300519bdbbb2ad702c2c095e5351a. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/UKMSJ2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a3066597bd02e2371b6214657702312a01b318fb516a042f07f6208c5432b3. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/UKMSJ2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c0d387b1ff751f434caf5be745f3ef2359a8803ff400c19d6bcebeb7cab3aa. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/UKMSJ2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f4a7a67ba114c75feec6352498cb30aedbe47d77391123cbcb7d94b94b2b60. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/UKMSJ2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8f2c72c76f9a71f062ad071aabf24fbad3d032555c90e3d74899e2ae1dd0e1. 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/UKMSJ2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76fe622dfabacbbcc42b70756ca8534b20f0de76483e1af7981e07406d49ee8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKMSJ2400004.