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 0x71c09c324fab3f46f4721e3bdacb5924593703640bf3e821d7e66b714494fd77. 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/41743b2e-dc8c-4ca3-86b7-e41dd1972233.json and https://artists.proofprofile.net/proofs/artist/41743b2e-dc8c-4ca3-86b7-e41dd1972233.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 0x5479f0ace4d972483e4331a624c7aac65e05616f059f88597287ce39e202f817. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QT3EY2443318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22f3f6720390a0169e39a0934c3f7bcb6e8a2e7849ed623ce88f1bc53e144ab9. 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/QT3EY2443319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0436da61572f1328ed5de60adcfc89fc85fad1f8ef5ca6ec8112be61ce1de1a7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3EY2443320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8bb57ecdab26c810af123219b67df348f11bf71050cb92ddee4fff53549154. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QT3EY2443321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f910abbb35733e615914bebeca26fc2ebc208fea2d35b8ae5a2080bb0f75f9b. 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/QT3EY2443323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ebf550f7fc5c4d2eac049aa5a70140e89d4110a5663da8f06e5efb776ca787. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EY2443325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f8d25cb9fde7237c31778fb372ac8da19c44654795996dfeea53ae169f2232. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QT3F42431818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf6b012b1d4717239c08d9d234c14d75ef437adcea9516bd44c4bbdee084666. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QT3F42431819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9672f60ce8fc5db4a10009b4fcfd1ecd692b378387a4c483db658177a69cc2ef. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QT3F42431820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb459615891f9df5963901f31661db6140c4cc38c4e3906f14bdfeb880a826028. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QT3F42431821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2534deb7759ffd53862d7ea82c013abb345e5adb899c249c0aa6fd4cddfd51c3. 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/QT3F42431822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1575faa15061d675d5bf9e7a045a4772572a8da6240573aa500e3b054bcbad3c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QT3F42431823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cacdd1275e4a52a825f07ad5b24c4438994ae18061867708b2e41386ee58a2e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QT3F42431824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b64449fa6cc1940428ceb7d333de4c0e78887525a6e0dea123b2d8bea29ff75. 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/QT3EX2493388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef00e79f9b09c4d2c6be701b1be24aa293c1136c914899e95ceafd7b91db2a5c. 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/QT3EX2493389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925ac19254ac87ef367624a029f1ecb7af597e6e35363d554d45aa4bad402cef. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QT3EX2493391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fede4b897840c933fa23fd66e8c35f35aee96ac05a11cbdedf8b80cedfc7438. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZFZ62550727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a0ec1b945f77802ee417949756a97ac80fbe93c25ac8028a3660487f76f285. 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/QZFZ62550729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99db770536ae3487688b251dec0cd9048968cc3c529fb73880d27c8f3666b328. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA82584638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88991851cb438a6c658866a454facd1e1afe49be09c724abaa35cb897643deae. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZDA82584639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c1e3fb7529e43a3abe33ada40dca6aebf401d66d57f9cf35369966a07b43f7. 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/QZHNC2502305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42ce6db893e864037a2c98f89f413f1cfa17a3d5c00a3f31a38e6be87a7e072. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZHNC2502306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1673cb373cf87ed8cf9c9dc283fc8b5db87b4ab7cf9ea48a41bd6399c4def23f. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZHNC2502308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc769a9e054a8b3674d268f511a16a231802791366c0f4c2708636d60975418. 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/QZHNC2502309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fc0fd82a50cfa221717c998e7f47f6ba695f57c3c5e76f56429a5f0c4ac7aa. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHNC2502312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb608a09beb5f1187af51bde06930e4bd8b5e1ec0a99835977db4582d0f03d852. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZHNC2502313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1301b478cb90288396918bcdb933fa2264f017ac05466e46672c12e692b79bb. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZRP42599972.