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 0x17eb738952119c174293f8509b314b912a520875849bc613854ab598fe326467. 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/ec492121-71cb-4b55-a094-9ef86d3f50de.json and https://artists.proofprofile.net/proofs/artist/ec492121-71cb-4b55-a094-9ef86d3f50de.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 0x18d8b2a4c408cadb07d0bc7618b6cd9fb044208bfd9218fe0a98b63c3e8eafcb. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/CA5KR1937634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf0121c5dfe2a35975379db3889f809287c0d5f20b66816dec37e4866bfb4ed. 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/CA5KR1937635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4f6da92af2b35fe98ae3245d8293d8b99c17c9d2930bdfb1d220767284fe22. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/CA5KR1937636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4a70dacbf211fd20e08033ebb576432d4d1603d596fbda2b58a7bd0751394e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/GBWUL2017439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0653f72479b83ca296bf53f8b018fb9383bf3f3e1cef9fb016e299f3b5870ab2. 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/QZGWX2108995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2350bee52dafba88fed78dc88a3223d4c9bef7c19c55c72591a6c1281b1833cf. 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/QM5LC2100325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6980fee31f8217ab7d045a515fbf6b46f90cf47fe52c86015b30aec4737716. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/GBUM92100150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6072a11b9c331880fff0b903a5fb49426b055daa6e647d42ed53e3b36889897. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBUM92200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff85d44408a3393dc8cccc095756e924cd6c44b3edb56328c879cfc01bd0869. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ8A2424266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a9ddb1fa55d1aad30a1418a0ec33ed12214eb96087691ef5601161e1cc2c17. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZZ8B2453492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79ac02c3089dc0174a56257f90fb929a8c8ec5b1e776f6e9025ad7305abd0ac. 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/USWB12305593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf763c695a6b7888ee5ffa2c0256407e33b0a30481fcaadbf9479450cf5fb57fd. 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/CA5KR2474072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616b523a62f4a7be837f3bbc25c08a1bbbf1f3c3b3f07b8ce1c2ca8703eb59f2. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CA5KR1956590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616b523a62f4a7be837f3bbc25c08a1bbbf1f3c3b3f07b8ce1c2ca8703eb59f2. 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/CA5KR1956590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d3afde1d3d42b24b242ef251dc3926dcc88965fe22066d0b441cd08fa392ee. 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/USDM32004101.