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 0x18efe74a3bdd47e8e463a3a86233374b703e65e980adb2206a375ea5e3938787. 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/20c7c4ac-8892-4e21-aa1e-99cf2a004480.json and https://artists.proofprofile.net/proofs/artist/20c7c4ac-8892-4e21-aa1e-99cf2a004480.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 0xc9ce39a08fde4d273efc99d33b5f172fb44304f0d64406dc61b839b04db9ce50. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZK6M2321503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d26312e88138663ef88cfc81b118b7c0d4dd5a0d60ef6e0127de6b0c119af99. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNWS2390237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce37eef8ed2e9677cb8331925f5f303e25fbbe2a1e315b454bb3f9908bb1b08c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWW2313204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd360949b4da8927d053e75086be8a1a410eb0e51424e6279c9ed4ba02c3d14b7. 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/QZTBB2388447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61bd4cbbdd50101b4b5bfdbb6057517cd2b022bee6ada46ae00c5e276e6ac05. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZWFP2361247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0026e9c37f75f29bcc1b74342f3cbcbf16f9abbeb5f99c4b98df355f598ebb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWT2469774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866d512a8a98d82dbf0866b082db5288d18ac8ec58a9bc242cc613c91c78e654. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZTAZ2433313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198168c0068ea95601728fc8bae092a9599e7355bd0c64285067db8d38d644bf. 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/QZTAZ2433314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3cb365f693da76b919c5dfcb80d5399d6c3b55f9acf3b317f444a611e91f2a1. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/USUYG1571031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d6d584b4468ba10d2c6a4456a6b3585e3ed97bb0c0dbd6395bf85228c6e728. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZZ7K2496526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7ce19c4bb7bf6d5692bb81e4209d14a9f994fb4dfd0ebc2bab50b6b7c058fb. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZTAX2569532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0963be03496b247e97c22366fcee5bc4c6b5110288abf14be9e1fb0465475ce6. 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/QZWFU2510786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859e96a8aaa73f80dcb86141c64b9c41e504877bf93a5ab186c9173178b791a6. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT3EY2577517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c64b57c767d5ca7cb73721f1c43a0f6cf3a781357a49ed100aae505cff7c36e. 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/USUYG1460888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f7f2f10345c89ae13f121c957109dd253cb08148e83c264267c70f1b777a9e. 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/QZWFF2320182.