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 0x03e72bf83a5e5f6ad27afc02dafad633030b7c74e5d4be666857a94f6ea484b6. 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/81ad39ea-a97b-41b0-9326-5fa014ca370c.json and https://artists.proofprofile.net/proofs/artist/81ad39ea-a97b-41b0-9326-5fa014ca370c.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 0xd6d0f95cfc5f97b76dff1fe43b4460da423a139cd4a299554e1d63c538714f1d. 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/QMDA62205793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf11d8ac577a0129d39d143d477bf9b835be384d1ebd993a5ec1ab504e3e301. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/TCAGX2358191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d761eeb1d944aee571b612ba584134abcaf2b4234ee267e7f5d27317e358c15. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GX89G2399997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7eb5e94a78b932f562c372695f7e79284689e47cfe4c21cb04baa0e2e0ba3f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLT2H2200444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2bdfbb202a08c3c28009b938daddfb3aacd04e55dbf6fdc9cb4b3d09dcb295b. 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/QM6MZ2274596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf114e4e90f531a82d29a05d5b68077e82e30ed540e6562198bfb2f668cd839e3. 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/DKD3Z2107600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ea3579026246bcfcba68f315b6ff3c53a3ffa3ad19e1baa360bb9c6fa8e1af. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QM4TX2226318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ea19f076947563327aa615132efa8510584f68cfbc85b6774df2011f618c63. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2219896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41033a79321271b6e9255819600e404f65d1e206ad5c5b941efe5f89c3a1350. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QMDA72164972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf418d0dc7181a1ddf5d8d6f5374ee6dc0e41e9eb377ce1163bbe3f943cbb2f5c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMFME2174806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2980df67be2e43589917150cdf7066c175f694e0026c1e3465887599ae66184d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GX3HH2115510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cec3962e908e8cfcc7ee8e62a41b95ffcf15546a96ec81097ac5d23c66fff44. 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/QM6N22191472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baf8eca4c2d0c123ab6896ced5c6ecf72c33081a450d16a48560ae2f24a6401. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZP7F2110558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7954cc9053108def9b15f3bd90a8282e0d08206de05f9cc39178b073fba45d36. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMFMF2020746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528d382b460064f68fe0c8f18fdd52f89107b02f44efe21634b74070a048eba5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CAWHO2031073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0d656e2fb14d0ca585c7a48d726a91aa1eab164295289af53ec2fd0265b78f. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NL2QC2000108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837d5659bfa17a95d9e376c6354cdc7597db413b39bf80a35ec544a836a2bb3b. 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/AUMEV2020364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d45a24bf9563c8b491b12d72f03c0d352e753b9ff138432f5c8eb2eccbce71b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU2044297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9011cd7d7db0fb143b74587c6a7c2bf114dea3897821038d55d21d8fb0ce69f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLT2H2400172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0714ffee476f847c2fae377d57e1656df8011387f982cd57688e3e53e03cf1e1. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GBLV62315985.