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 0x50f021269a66be8dc8d56ca243441282397f00673ea88dff3e940db95b979910. 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/cb620868-342c-4f2a-8f86-604617443041.json and https://artists.proofprofile.net/proofs/artist/cb620868-342c-4f2a-8f86-604617443041.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 0x400cd01b4682c52aa2f6c1794e99eb1a55bc782f56e55e7ed4ef3ccc9b357fb2. 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/QZFZ72035107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcedb0a2bf8faa5580008ffa98ad61346c2098d3caf0de90696f41825d55501e7. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZFZ72035112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42b24a098f3eb9aade049d087bc2c557396e4b2c066a1f4918310535155bfce. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN92069001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c9b4c6439d5a41f8d794a583523d7f389be8fc5980d63ade72ccc65307aaec. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZFZ42096060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84680f18e1fe5b3cbfcdeace609055f73e2e805fb1f87aece8dacff50193d7c9. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZK6N2141340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9c3c2949d05206498b51c7efab473fd86b88ab9513fc0b554e3b4eea87bc92. 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/QZDA72289284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2541dfc3de4b36b8c6d6693288f67affd0c12c90fde5665de7a97157c62956. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6H2319501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bd50d345510abac14d93c75fda10232f199cd84d05912e819a091a037b7963. 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/QZWFM2371858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d90d027d13f13ee05fac6dde3ac33d1e509be80bd91b886f77090fa96a1c1b4. 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/QZHN62330833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67342f8fec5fa2acad31d7e12b2a1104dae14f779bb632880b9319cbaf070be8. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZHN62330834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565ff29316a365fa0bef1f80b111feeba39057e7b5b1d2ba2a254e56a5a73179. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZHN62330835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe912451593c94ddc9728c9510fc6157f21d61a1ee85f6b5104e30fd1ac9b0d6d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHN62330837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08f081a6e184b734703843795acc23ccd59c8198d6ee33df28e2194c5be2471. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZHN62330838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe987803620410ec1cc4bdda000f7cc4d592ff723a5e605bd583bdcf705ddf8da. 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/SE5BU2305803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe640a40e9ed437e3356c908ba59709889e591f6f546e02f6ac0a5533c82af4a4. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZPLR2262564.