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 0x38b302f02ffc837460dba321f0438c7e1ab4912b2a40009d8ba4ff3da638f13d. 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/419fe086-8db7-423b-b0ba-638df55799fe.json and https://artists.proofprofile.net/proofs/artist/419fe086-8db7-423b-b0ba-638df55799fe.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 0x882c9b6618e476a9c9509a2a6dd0bf84fbac7702ec83ff6769b1e42cb1894b32. 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/USBAE3366098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4517400ccc552141ddc408ac552d900186afa1f78085707924b6a3790169c7. 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/USBAE3366646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c128c2d532addf0ae19fe4636c67c6f021f2fa9d5f29cf1af75a91ada157a6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USBAE3367631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d4ac97046b9f2300db76fdd9faf3e009c05cddd95d048e2acc130b3b196a5c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USBAE3368281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb29c3e735ba71cc6129506739b87e8bbcbee2c73444fd0d76b285f6fe77c1548. 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/USBAE3369619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f3beeec722ee73b987e2b48905241e694cc6203b8adbe352e1095963477c6f. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/USBAE3369796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc73afbd1a806cc7009e12534918b6a3adabeb1688f0ea2faf6dc9a8c0ed517. 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/USBAE2100119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c30da2aad47466bc835c1948e1c702444628d1b8baf1b023244839b68afaf05. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USBAE2100652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c7c2bfd1c4718dc659ff124672a69ffeb9b8cc78d5cd645c3d5ecfe18b91be. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/USBAE2204164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43bed5fefd6cec099276e80bb5cff9c5397be0262ab397f679ee8ecadba78f3. 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/USBAE2203266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45441299958cd710df632ff2dacbbc9eb49f295ffc1dd48230fa1a0bac490ff. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USBAE2204500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8775db3558ace1ac2b859d034ab20e5c9b50e9b0c9b334540f4644848dca1c7d. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZNWV2220749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaae3753b8f9be21ae88eb60a67966bf7ff2f64689ec91104f01f880c22da0e2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZNWZ2268381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4903bd6b1b880f74b7141892c846f708f319132c603e0ab33eb119e9dc85d6f. 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/QZK6Q2301247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9b74a713d27eb4d689760f2f4cf89ed51e6a86441616dd1e6947148bc612d0. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZTBA2202835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f3beeec722ee73b987e2b48905241e694cc6203b8adbe352e1095963477c6f. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/USBAE3369796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe302fa6def2358311408163a4aa2ef3f273a6de1ffefeced737bd0bf88e4a126. 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/QZK6P2373945.