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 0x3dd21ca0d6ea23e705d11ecca4016d02f0786c6d1be70e960640b897186100dc. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca6680bd-c054-4a69-a493-e47a5aa1b2ce.json and https://artists.proofprofile.net/proofs/artist/ca6680bd-c054-4a69-a493-e47a5aa1b2ce.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 0x4f6becdb2c0fdbb9362b968f8e7cb03c29bebbc596f22cbe32d6a7ab964d4dcc. 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/AEA751300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa628af10f93a6c358e96fbd2ea81cbebd35c0054983780dffecc3efa28ff721f. 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/AEA751400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44f0e7659e343983aa7abfe59afcd94b32ebf92a0d0742bb26384ab02545e14. 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/AEA751400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dee62ed8e30b514885b82a5489c281bb4ca8f3fe25db460d5056a402704c4cf. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/AEA751400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faa4c83ca5dff791f66ff9a99403f61655f84350fe9700de870db08875dd95a. 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/AEA751400049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2191233514993f716661988903157e983386a16005cf62b91cfa771846a6e93a. 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/AEA751700014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36828f348397e9fd844a6fa804c7a824970ef86ab839c2058526616e6d5db17d. 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/AEA751700015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadc77a7032d2ba9e2aa577df8db3377bd2037945aad1282a4450e1bbce5e45b. 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/AEA751900015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84fa89c9c056c84c8a63db9b443a95ddb88de7f9e9a0fe2c4b3a887f130830db. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/AEA752000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ab6caef6115a79054ea223a7ef41375faedb38503202be35a77afe030079db. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/AEA752100061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d8b0f01f00b041770243577480b82d30d85f69f88571f0323c35cc06e99151. 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/AEA752100074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d8ea19c634d4fa68eed2798f1cd350f9b1c7ab08d24eb2104effdc00a0ac49. 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/AEA752200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc11d7629fe83f78f80c211db22bd2c5d206a59987e67987929bd33e44c9e6a6. 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/AEA752200051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc971262b25aa7f37b171451a784ab0f54d5570ae78dca7b9fe3e9c93e406978d. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/AEA752200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b59a375666129cadfad76730c83dc44279346bd6ab3e824b402e01002dadd1. 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/DGA082350494.