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 0x0766f63ec29f58047a337a6591e0129f553d5b416b6e7a94a43ac9e6301a16ed. 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/83744036-9ae6-4710-84a8-b8fc402fda16.json and https://artists.proofprofile.net/proofs/artist/83744036-9ae6-4710-84a8-b8fc402fda16.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 0x7ad02dab1e91e37722eaf79868d8d3b70ef005c271dfa06bd78408d912baf377. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITG412100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x280cdec7d45086cafd3be48314b2c79a6831a6d757bc77cc9fdf28c04b6f7e36. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/KRZ292071537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01075184fd1100d00f66bcee0cee3b76a417c885700081cc3f7bf4dbc468fe47. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/KRZ291832625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70553e0717fd17ba30ce098b994475affad4d880ec4f958ab6b7198bacf15a7b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/KRA341655518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390228ed0511808ad0a93a87b7c23383b416fe5afc3b82dfc586fe5c009b271f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/KRA341655519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97831e14843c7e07f24e7d744d4b3f78b7901974b9b3798fdd7cc40452d88abf. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/KSA012274904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89005d46a9a1b1b49dfe33f9ffc97f7539f1b43feb9fcc17787ee1978a331b7. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/KSA012274905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0406537119a82f2c5287fe73d958e6ad1373cb766ba2a4b280da2c8e609e5943. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/KSA012274906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5993f4e553299f7462fdbbc5e3331ba1df62100e326e889585a01ff5ba943f. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/KSA012274907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c07958844fdf9e915d6eae595718a3dc1df78323735d2254574fa4a36a4c1de. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KSA012274908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1eccf8abc5180cdefb32e0682c2922dffa788b4250bacf8a5184ae07bdb0a8. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/KSA012274909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e99f47a063ab5dff7b761e84a3d666a2195750c18434077018dc514b5e0efa. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/KSA012274910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbe43d89f14160f33feac46a301e317482532e008e315a6529c27c32a88a967. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KSA012274911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472c200fc8ba7196f44eb1f7461f3567cea37288673c59e35f5da324bf9c736a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KSA012274912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce9f6092235fb8b45fe80902f4cc84c417867d24bef09ca0bc8f3880cf1457b. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/KSA012274913.