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 0x715d7a6428ca71bae7f3aadfb1b05449a1d94d347a4d04c522d5a085c35249a0. 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/afde32d4-7743-4eae-a8cc-a0172d592a4e.json and https://artists.proofprofile.net/proofs/artist/afde32d4-7743-4eae-a8cc-a0172d592a4e.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 0x32d698c50d27c87f4bbb4fdf2ae5601c80b90934bb8048697910b11a71690297. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), 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/QZFYX1987498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f175b60ca7a40aa9e4f6fc37c2ecc70ec71aa36accc677ed80bc09989aa3a0e. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6Q1950157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fdb61c96f78bd28d4f37a1de1d4de7cee0429aaa26524dd4b59a6bda376974. 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/QZK6P1997541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7531fd4437590675cceb7e17b1859d39fa2b2e7516343abb9a1d6a6ee7f4d1e7. 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/DEQ022281451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bbb3099cc563cafbd60629a743944ca9acef8213005a4c8dedd3d87e77a4299. 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/DEQ022291355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4678c87af994c00dde27cdf93500882e5fadfdf1b3591638c3d27b37babbb025. 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/USANG2216966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2e69f260673b51448ad9fd86601d495b14b7d98816078ff081c6a4283dfc89. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEQ022381150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e1f322112dd3bbc30345c7ba3ea0a0cb5733cc9140c133c89e7b00e409cb89. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:47:46Z), 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/DEQ022390839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e63d7d84394f82e8d35af40845d944c6bc9680cad746e1549bd844e35a4d4f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US3DF2412710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca7b075d3c753663f04bdb7c98134bbf3121065ef9aa51bd7c90bd189fcd6fd. 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/US3DF2420478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270b09acd4900a6fb0533f3763939e148da57e1d4cee57b398e36c12210cdf73. 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/US3DF2465315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c82079ebcb39af4b25a1378e5b2d1c6ff7bdc0c1ab78396c7ac5e892e99bc9. 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/USANG2441455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5562b301e5a77cca5d2307126c6e381e4659222dbcdf77d61bf44ac1c359e1c. 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/QZDA82012224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda85484477219287586250a57a998666f0b9ee84c2562bd7b81483e706c7922d. 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/NL1LE2403502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ade27252b64bb95fa55d4ca6137036e9d9f7f1d13c04b2320021f3be55b125. 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/NL1LE2403569.