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 0x11e1e56dad0c04eb72d24b5ab68f139669126ab4b0a75930b01e3f38882e3e03. 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/71be86e8-ad19-4731-8da1-755bea4c45a6.json and https://artists.proofprofile.net/proofs/artist/71be86e8-ad19-4731-8da1-755bea4c45a6.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 0x60967a7d6711641b4b6f35b18b17ba4ef3eefc6b825c517ffa1f317ba24b7fb2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GX3Q92502791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd9e5b78e23c2eb6429a3003551026582982eec720755faf87f4ad0fa1b641a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX3Q92502725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68d1ecca701e663031ae2c74392965634d6525a6b06c1d7e9fa68deb4ec999c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZZ662415857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790e6a909828083d36164aa9a8b9d2c0e0261b5c4a9a88d67c4c2f57cb882f13. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFZ62597831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008d92967e56954cda07295e73dbb55149aa2ea8da6a0c9d709d6a629e03dcde. 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/QZFZ62597832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x040367cb163b614b14e105478b5cb9af0ed5da04729dc5a87cd108c62c8fea93. 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/QZPLS2447975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235a31fecaab40308c80fda2134db4e5a1e151092b4d4c5905081389205c4f67. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZFZ62597833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444f96f42b3818b9855f5882777cd437ea0f7e508357315d3beda1a552d9400c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZFZ62597834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa1616aea29ca8af11b458e4cba94bf4f244857e82eb634b7fb78294ae937c2. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZFZ62597835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd358cfa6299bbc11ac26b94de224d1397b91635db5b543c07cdba98dabc869. 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/QZFZ62597836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f8bf82ee0e94ff83b4afc619f535c7b4b5ab2f1f073f37109072156e0ed557. 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/QZTAT2428191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4180d944e9459f02463de96ae21c36ba39a7a993826cdf1eb946e9f157483c5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZTAT2428190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3475d9850532ebceb3b67e5cbafdff3f5075c4b808c7abf61e97e8cdd3f5819a. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZFZ62597838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc28d9ca393eeb40702fda75f99ede0e735c79c202e8dbdf69d93930dc772f465. 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/QZFZ62597841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b25f50127771122acd590b188f3b12dc999702dab80990653480212f4267eab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZVEM2571475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fb39e5cad1e79d30fcd519b8ca06535c36daea7dfec4474790b332dba8c6735. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/UKXN22599106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb381d48c52dfdb413192949a2f94d59bf34442fba7b3a1414dff239cbe044ed4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UKXN22570282.