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 0x4294cdc458bf53cf5e72e53a4f9766d418b811870039554ff4d8a55320961190. 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/190ac0de-18ee-41a2-857a-43d829ab44ec.json and https://artists.proofprofile.net/proofs/artist/190ac0de-18ee-41a2-857a-43d829ab44ec.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 0xc729ff0b4885ea513b0b28136a3ffdf54040bbb17effdffb4ca125ec87c76b9d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN62143046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e513390b613a3a9771674a9bd957a118a973ce700bec15439a76e7a31e629d. Chain 2 (Bitcoin): anchored in block 956713 (2026-07-04T23:03:25Z), 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/QZFYZ2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe059a4907cfbc16d09e556a3af550e586e2d339af70d0f6d3d77b761bc3701dd. 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/QZTAS2285991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d1a34cd30142d990b10b77de0fd4d89430303a0eea0c43cf8a402c1a78ed274. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZNWS2388223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4b7f1c1f87fe28119c7e9a27d239814eff5779c48862af59974a090381d806. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWS2388224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93391ff66cc9f5eb881787e8e106ca442cd3e9023e97f26e3b96590d9f191503. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZNWS2388227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e622034ecfbebe9f42866ebdfa5de126f4357878230347914f59627765cdf69. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZWFQ2328379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607c5c1dd7701177b3837079918cdbd0e1a026bc6d7905edbd662ab93b69638f. 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/QZWFS2329118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c1e4d920c44d60c565f9998b2e65bd7b15c7089042aaf34168267c47ea6efcf. 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/QZK6F2565464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787fcab4416c2ce59889f823cede8d48e56a33c9c069ee8fb6529ef25b7066bd. 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/QZK6F2565465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa919cd4811986a86fa5144242cf6ff0efe28220899b7a24887a41058862fad08. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6F2565467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c3eeab30d34ec1a55b8202904fa915d2dbc51622171ede5b2dd43c737e4f51. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNWV2539317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb843fe0816e636a14fcf8623919b5e27f88f5a2fa552daf4111073c19d70c2f5. 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/QZNWV2539318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3492d7439e842081051beec650941540a0379ca02f82b5bcb0b65e3abaf96817. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZWFN2417538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0ab44b95f3640eb886fc0bee6dc17fe6e311466421500c2d0d3f90c82d85e4. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZNWV2539319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc0f7cbfeccff0224193acf6931366257cc2efd51df2accb19cc9b2dfdba9b87. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZDA82543165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2dddc113debd051761987016444976d5df558d518991fbdb77425bf159989bc. 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/QZWFR2385824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc99c24747dd2b43ff32c5f922c5859baf0226faaa6ef71277d12d984fa0871e. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZHNC2482456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cc136c057cb6f3539568a49df965e3d7a2e9e93ab1d73e610213831c808ea3. 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/QZNWV2539322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc176bad0e33a6f2e3eda08f02fa8c709b094002c113d42af1dd64b66d6178a7f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTB32502314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ee47ed0f129716483221be81c6d26dc45851734b0784f0fc2e1ed398e9a5e4. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ7X2526804.