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 0x974260f80714fbeae33081569e14dc93d10acc8f38144ec2c88b869aefd0d73a. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fc25125-4e43-4291-a420-2da992ca9438.json and https://artists.proofprofile.net/proofs/artist/6fc25125-4e43-4291-a420-2da992ca9438.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 0x7d79aae9ec390e01f3a39dd4e7a3bfb77972512b582a33b1f0e42a28577fa79b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ESA011955237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8bde71d0e90bf8954fb2126e1969ed9c7bb4846a6b62a7105b4017614495fb. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/ESA011955239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffadb05f72a0363967b091885fe0b1b4d830ba96121ef0b8b484fa151edbcbb6. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/ESA011955240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc11b9b18dcdf484a93e765db3254e75848886938924539533b84f3091bdad46. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ESA011955242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5497f79fa418796eb1018862902d9249d53710e72897a8454f6d108f9175ca3c. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ESA011955243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04fbf3a95c2b54e4affc8cc4bced106f5b5f3a6d70a1f7fea86c133df14757b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ESA011855082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea37766359c43008d58188030f88aee78b41fd148eca20f06815836a8e43685. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ESA011855083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7400d1df10c3695a7ccfeb67fb33a7402d634c95bec45080454827ffcf8051a. 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/ESA011855084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa887c4e0a79ebbe4f8a5a80489003f4f0054c03fffb7af78e2bc0ac448fe228f. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ESA011855085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7767c0a6dfaa479a118c99e2722d92f2f500ed820308140657ef8f6b89cac268. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/ESA011855086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20bfa482fd558e6a7bb55ff9526f764287c01afe2e9029a206d6f886f934416a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ESA011855087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf352fc92157fe7e6d7d89a00fa33492bc5a4e4283cefcdcf1c9fd7f36eeff8b9. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ESA011855088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0558ff5acefc522812f9e6ee2d0e20ba19f00517aee780a859b8203ccfedd906. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ESA011855089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe625fd100ccb93d503bd79b8ffcfede1788f6c8620c86b470f2ddb652feb7118. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ESA011855090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed3bba54a03ce34fc8fcde5fa64db5cc75806f3262e390f36059ad71de18e19. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZA56E2200035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4133de70859fc7371a998285e623a3a23b46d638cca0f25955021a03e59bd2. 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/ZA56E2200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7137401e3e51c6b4c0e47ec020465b6e29306c8b677edc75bed69198a5746b33. 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/ZA56E2200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8fe62e448e6713df85117f719fbe0786f1ca54d7b2e792b7ea1e437e402d44a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ZA56E2200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92349dad2dfd0848e47165387ed5c40689473dc1f9b738bb8b516f8d659a299b. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/ZA56E2200040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe108afcefdcfa7787115d24182d74944be2a58fa923f9277e5b7c8479ff75754. 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/QMBZ92476703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe108afcefdcfa7787115d24182d74944be2a58fa923f9277e5b7c8479ff75754. 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/QMBZ92476703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe108afcefdcfa7787115d24182d74944be2a58fa923f9277e5b7c8479ff75754. 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/QMBZ92476703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8783966a38359c599ac32f5b760a25c45de0995d621f9387513d63b66a45f0. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMBZ92476705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ea0533ff5375887dbea5f386a6776784600583afe573a9a345c802035504f5. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QMBZ92476706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe122a993fe3d114824c3423ce1889163fa9d2f2a5e3b990e656cf89c43e05484. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMBZ92476707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e57859af33d13039338819ee732854fdd71738c294a804411f58311a4c36fae. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USUM72222070.