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 0xc2dbd539b5e68df32c277f812efb04efcde95a2f7ac64f8eba8d1e79912e8e8a. 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/f390b766-20b5-4e27-91e1-ee09cd2ec938.json and https://artists.proofprofile.net/proofs/artist/f390b766-20b5-4e27-91e1-ee09cd2ec938.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 0x0d83fc498b3cc45212bff8c47c9418dfae3f64ddb86ac205f3be5c757b7311ef. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZW9L2334874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e46d525e14242de0fdde975dacea1bf8f2ef470f1e8b950aebd683bfdb95441. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZNJY2277821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2fc2dc82ee50ae17f46c67a36241c5126bf07d6c48dbb44375d967e0f2a8de. 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/GBRKQ2115303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5ee003913012f87588e44f506f0a774abd9b267fbd72c9adf1a8d56e70276b. 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/QZNJY2277822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24b7b7811cefd1cf0bd6078e441e4724e02ebbfbb57e9c4115271e13a0b1800a. 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/QZNJY2277823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae525a4483f95be24e8038b4c99c37f87ae70bd6700fa10d7928a7d0ed1e0128. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNJY2277824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610193b28b37804b0e918a09057ee32bb37a1bc4ac7076dfa208e04c260fe4fe. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNJY2277825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ed89b95450da5f5a5ec4905f7cec461d9773db45e2174abb792cc8a7f10fb7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNJX2067849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe672dc01d218213b376b0023baf5d6164a6c0ada31b78ed757be14f509e82b4. 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/QZGLS2307847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715c4f897ea60501cc7378c38ff4890b95649352a108356f6b876578a6fbc29c. 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/DEQ022002348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4afdd99847e79cc96af05e5fe3faf767ad1db0f2efbf2bed716b2a5e1bbe0483. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTRX2476080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a2475c620e2ed3b45458a01c5c7b5fea155f1aed72b4dd7b687276651bfb42. 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/USLZJ2433495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697133efb255984184bab26b522f54c6f6ea97185c130580d6908d6864a3efbd. 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/QZGLS2541337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850d5c45d4e6c2eda3ce9dd2ab5d5dbd397935c2e7cb5598fa5285cc50b3e171. 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/QZES82533369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe95b6d81cee2357d39e03e8a50ff860d23d822535be43eebf10903411bbd217c. 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/QZWDD2531538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9082bc7dba19aea4e01f8759bb88694025955186ab3aca805a8cb8779eb1735. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWDD2531543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aa525408d2d8d0eddce4dcb6af4d2a654fe13091f9d1e2ac2188422ec7dc653. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWDD2531548.