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 0x0cc72eb58691e59a6e82bba5d5461baafbbf910e18a3774785cc8d6c3c6fcfce. 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/6d5134b4-2fc8-40a0-9e2d-7b8859f9f545.json and https://artists.proofprofile.net/proofs/artist/6d5134b4-2fc8-40a0-9e2d-7b8859f9f545.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 0x7303fce523129c97c39145f66dd83ec60c09556ae590d5996e228d0c6074378e. 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/QZWFR2407582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34103a0c7069c38141471f9faa2146e74e6473bb22353526461c85a7dbf67f09. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZZ7X2482145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120c8bafec09075d34fd558075c64f0673cd6c40ba70159b349ad4883b1baba5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZK6Q2508427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0455ca59492f61d0d3ad049864044df15db85546516125b88aeda76b4265f0aa. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZK6Q2508429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea5fe02d71b7f34ac62280d82747849a105d078a1b9a08bebb63d6361db37a4. 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/QZK6Q2508431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39435b218a3540ec89ad860d13037a39d2ae64d0d65556dee02ebaa943a9a57a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFN2544261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9255f54b1bf4fbce3007a2cd83e95543d9b6fb31154664a1b25803e0e5b59eba. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFN2544262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e338170b54ea0edc03d783849ad83ca906befd9525792116115f5e9fea1597b. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFN2544263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9008fb799d71f6a4a880a7102f31f5ec844b40424b2a56552d12275a76572e7. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFN2544264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8246637846e5ff98c59a56b8a7d28ed063b4d83e2122aa608e926040c0d792. 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/QZWFN2544265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5cd29e33481dd49622deabd3ad310940e3d495f8c20f75ce411f4043cb3915. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZWFN2544266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067d5cfff02ad69ae1bc2287f3d9afc1fe06c2b867a7731e44156aaf37ab0524. 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/QZWFN2544267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb30f6f107dd578d60b31a1128a6be3d02095c9e589aa5982b31ebb177fcbf8d. 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/QZWFN2544269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedf12510ad6cfdc51bb8baa83fce818036ec7361d9c69d0da871101dd0357e5. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZWFN2544270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2091e06d0462128ba4d39f8416a3d22682287e8254b216f11483eda438c2c412. 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/QZWFN2544271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3e2df96fe7164739cf539d09b4e6b12d5e141a8ee7eed4390a78b40d970ba5. 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/QZWFN2544272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bf37b83e50ea2e9793103f50981ccd6913030e0b03a34cb8dd5c007763519c. 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/QZZ7P2458411.