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 0x8c3b81e0f811079d16c97b96ccef6cac68be08adb5d7d51f65b3fc44c0a97143. 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/0bffff3a-5a07-428b-95b0-9cb0741479c0.json and https://artists.proofprofile.net/proofs/artist/0bffff3a-5a07-428b-95b0-9cb0741479c0.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 0xd3d9a04381f05a2950ae3db6171eb5feedd6dc05e13918607ba263b26043f954. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/QZZ662425868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d9a04381f05a2950ae3db6171eb5feedd6dc05e13918607ba263b26043f954. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ662425868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dad0fbcddf0a5f331cf540c49e8eb7f5ac6362b083232ff9e357a69f9c205c2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZZ662491640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfead96cef3ff01f31952b09efcd81f3eff119e0fa564a2a84a7216012e91850e. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZZ662491641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884c6f186aab3a24f9b2f0107008a126249299589634f63f5a0a482c47bb30d3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZYFZ2428828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884c6f186aab3a24f9b2f0107008a126249299589634f63f5a0a482c47bb30d3. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZYFZ2428828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303754c9a520e51663e8252cc8fd1dadc9c529bdbd8580248409486c30873e35. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZWDW2433163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x303754c9a520e51663e8252cc8fd1dadc9c529bdbd8580248409486c30873e35. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZWDW2433163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c4e040727f7832e29e9ebea732db53a67405a86ffec5a24fa9c06f6bce3c49. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWDW2471573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f8414d92c47554e245880a61a63420536d0eccc2c12673f7b16a5ef7076295. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZWDW2480666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1baf639d88bf5aac7abd09edeb86c8e04a4ae7ab9c84f78a5d7a426d909a988a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZN882403167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a70b38e4985760b95bb7e4b6ad4df4f09f2f100cf2f683ed7d9838e74e59efb. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZN882558444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7362c384dfbd7cb553af2f276de8248129401e815a8a44b470bf6f8c37c8bebd. 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/QZN882581605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec9eb3f76f2a76bfe88bc073001eb63672cf894fe51e993437962404fc431cc. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZWDW2551546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2072ca78dbb2cde13d5f42715a67c6961fbb45f7f6c8e45eda5f2c05080055. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZWDW2586190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bee79281639fd1121bceb92d73a92e2af74007ad58f5179e816a564d41cc14. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZYFZ2512709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac883a53d62479f007914ecaa84e05c098e19043e118315da31a675f7dae9501. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZYFZ2513015.