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 0xf1be65b04248ac087031b99d1604d28e9774ab2569a5b67e8eb52bac402717c7. 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/571bbbdb-0406-4965-8a50-df267f76f31d.json and https://artists.proofprofile.net/proofs/artist/571bbbdb-0406-4965-8a50-df267f76f31d.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 0xa27c614a942db44c9179eeefde1995720e303ac4a18f2292addb91f32fff3d60. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6J2463814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a17241cca874d48622ff4589d717c3011d50687f44e3c7e0e50c053524b5bc. 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/QZK6K2476429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df228da4e536c49f5250aa3a12631c3686a2fb7a4f35328e5d4ced3d40ae4d1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6H2491767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7e8d47757dc269611e0b94fff19f87dd93e7c8c59e5a56c81a462596bb65a8. 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/QZK6H2457040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e21815eee86d4be236f88f1cc92b09d186db7dc6dd92a51f6b3abd4300a990e. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6F2462202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79892c35b53fdc773ce88156a3520abffa8a01beee972e3444c000af40191e44. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6F2436081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ddea56585bcda19fb3f0930c52c2ca3cf8a62b17d840efcbcff26b52f227a1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6G2438990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f73a1b224e600aded1d68bf40189a63752bfdc2a4919f997d07ce7d343cf30. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZK6H2459572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9b5e0bca3a27037afc6fb3d73edcd5e3a1e8dd6193861c801cb394e0ae1fac. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6K2416094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d8e1835003df26f337f914d3872f15a3b717547eb007c4fe5949b4a798e477. 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/QZK6K2485016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0be14a1ae399ba4519e03545696e2512a4db0641cba5a3859a47561b5dfea3. 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/QZK6H2415964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bedde3cc6b057d8804a48f8952edda1757226fa8b5ece206e28ee178a228a82. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6K2465776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553f79d5d1e72a0607e8b917a967b1206ccdc38d207bbcdc5c26b7c4de751733. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZK6J2478285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918bf1dd8c1ced90964acc5fef9f456b9f8330c1f86cef45cf773666267eb0aa. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZK6F2428338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ecccb3c886d31bb74651e96ef3f42a7178e7c7569850892fd9affd270ff949. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZK6J2490376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64a2932a12d4192147f1801ca1827b9a0b6049ec5d7d51df5ee180459ef8345. 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/QZK6H2441012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec8398483008a63a21496382dee7b8b50317e05b60e15117a31897266ce65988. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTPX2408139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc608a2088cd9de2f869f2ecb4e9d23357927934641f19b7a0f7742b0aafcd44d. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZTPX2408140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad67e787090923a18325e669b5f78d43502b481c3f0d097cff53075c6c83989. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTPX2408143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3d2fef681965337027851ae832bbc9a8c3d1a0e6a2d34581a434feb7124301. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTPX2408144.