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 0xb1786f6aca3e63ae1f0620280dc35709e2677f270f632596e6689891067aa54e. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7dd31ac-bbea-49b5-992d-0b62234370f7.json and https://artists.proofprofile.net/proofs/artist/a7dd31ac-bbea-49b5-992d-0b62234370f7.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 0xc0765af7f0cd48682ead17c1a4ee93c3210c19c79a4eef91a8428ece40f48214. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/CZK872400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca39b721ca2295949850a2198adbd177464925998c8fc448dc99cb29bb4b376. 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/CZK872400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b1f9b823e7698784f234fe5480c328c18170a482234e410cbebdd2e640a1fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZK871800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee69755e0ecfe1c9a3e317eb94e387657e8b25b034f428e51e9fab7988e257b. 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/CZK871800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb623e4af54f819f377ba8f52ee16ae7068e93b261c047075bb58592404d46963. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/CZA210600933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48826d195f49207605383d543fea605fb589606eca0f3eb072e7d6c1ddff9e35. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CZA210600943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa153593a7ec16fc1b46d3780208cfbd0908b591322bfc3c6c3154d8465f606bc. 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/CZA210600944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194f777d2ccca0729785cbe314a5e71de61d8c9a777de07bd21acf82820ea8d0. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CZK872300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75372203c0cfa5ba9f4e0086e815f3afe92e28c4cc0af2fe6fb514c71d4c4e7c. Chain 2 (Bitcoin): anchored in block 960161 (2026-07-29T22:51:26Z), 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/CZK872000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a1e5b5c6def4dc77b05eb447bd52f4e2dd7b192b6e34dac5a50f0d69280217. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZA152400070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9730a63216a716e01417168408b36694f7cb0e38f7816884622c4a47f1d6f7d1. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/CZA152400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024e1c06264c6042d0d2d5c44de5ff7651c46e83089fe42574f929ac333f050b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZK872100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a0104063c12cac424f2507a30faf466619b40ac5b1cc3b5a53eed667887289. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CZA152400074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90671b857138776dff18dd34e64e68b1831ac63cf088a3121f3f3839b928e9be. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZA152400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb59638ee88edf7337f0c0c07f0a84f54d7b4bce659501969268f3445d05abe1. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/CZA152400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd91ec55f46458f31bbd96cf2042cc3cf478e3e6ec122d9541d4ba982d26564. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/CZA152400080.