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 0x6fea30058866fe475e678f69050ca2b1b159cf97dc2121eeb7776c8bddb224cc. 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/3fc7f236-98e7-480b-a416-6bc55c7a97b1.json and https://artists.proofprofile.net/proofs/artist/3fc7f236-98e7-480b-a416-6bc55c7a97b1.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 0xd2f8c71608021142c297110eb7b10198aedd9977ff527af95440b94fd1a74999. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/USANG2286704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa642b09204599895b56d0d0aeebf0740872651be2b7f2d1f76fcc662cda9d187. 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/QZNWZ2173858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd1ddc7a58f21eacb9a7590ab214383aaf78020acfaa8b5fdd5e71eb2606747. 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/GBLFP2320493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7303d0ac5cc5a1d45b96c03f97178b27d5385ced266bd0a6e603785f98ef31. 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/MXUM72401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e6dd14d95f6c143dbd2a3becde82334ba87954186b90e70c320e1862eceaf1. 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/MXUM72402217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e6dd14d95f6c143dbd2a3becde82334ba87954186b90e70c320e1862eceaf1. 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/MXUM72402217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a93a6a47373605a46327e24c6ffa62d8a82516c2b55842c004353ac433f7bf0. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/MXUM72403176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4d9904a75dc616cc53f3bbb6a5604b29bc54c8e5595755b1adfd157401ecfd. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/MXUM72403178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7303d0ac5cc5a1d45b96c03f97178b27d5385ced266bd0a6e603785f98ef31. 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/MXUM72401795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20ecb196e6797a20e2c6286877991790445a2f8ebb4ef58bc4c8277bad93f88. 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/MXUM72403180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f7f30ce23981b78919b9a2ac560fac87d009d225e5803954c1744ef2e14671. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/MXUM72402525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cac98555185ad2bef1a5c85cf9c89515d6cbb59b2b93daddd9cfb98dca96483. 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/MXUM72401096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddea7e965aa46689dc43b66571d62f2674c62cfeeb68e5788498392fac51486d. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/MXUM72403186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8d3b1f543b3bc6188637400f87313f5fca1beea0ae88076c98a6d3f34ca518. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/MXUM72403107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6034515bcbed358127017b63fa2fed7481472a80c0a2eefa1220badab356720. 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/USL4R2143433.