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 0xff0b5616e1a996fd46d61fe075dfa4217c93a2562d0dc03de7c98dda4ca880ef. 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/47c16241-bd68-485d-9340-b835f8a846a9.json and https://artists.proofprofile.net/proofs/artist/47c16241-bd68-485d-9340-b835f8a846a9.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 0x7f757a9939bf074637563f6fb6bb5eed4d298e410237fc69ed80c65541144962. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZW9K2346779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6822cd91990ebe04d2959fc162154c4229d2769137a5a549309444204d92a6f. 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/QZGLS2458375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab4a192c5a83aa5af611fe30f275263b338cc08423b2339dcfe05c410177273. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZGLS2458376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bbd8f1164c96080fd72142c2633f6a12c5d3e6dbe043b0f1968a267df466f94. 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/QZGLS2458377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a85177a9abe255ee1c9447d747d2f2ada39be3fd5a819a08d17caf851f86ed3. 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/QZGLS2458379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e5350499ce2caf7f97e939ce79af1edad5a31996b5ce7990d302a71fb30997. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZGLS2458380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52de1e4432cc1b6faa304273c26f3844c9746aa1d1a21295a099ef53321e8bd1. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZGLS2458381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1193c073ee7ad71bedef4693dff8f8360c4f9886dd50c543da48c410da042ed3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNJW2408956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7f8e8cc9547095edeb7ed6a10b11a6b9cc14a0f1f77d8848751fcd7d59649a. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZNJW2408957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7cc64d6ce6bcda8141c8dacb03f27ee48c7cd58d6baf50ee196deba45c9459c. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNJW2408958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645ae70d589ffdd74f36b1bbb4ef502cc7e8ea6bdc583eeffe243441b02a5e6b. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZNJW2408959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf3fc43cf3dbf34870a5798c0374b4de1b20673e69b0a7a241a1b4221359410. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZNJW2408960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073f9af65834c9be48049b619405e5e42cc851392c7b6c3b341c082b0cbdfc18. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZNJW2408961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c0b581a3b183103f1d4e15a4c41a9bbd9cff9aedd6310b555937eb375afe7e. 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/QZNJW2408962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dccda0bf6da52aeea6febda8aa95b04dea51aca9a45c6622ef0bb178436c9c3. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/BX4IU2419721.