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 0xa92312acf3be8eb1b575d4d074366540bcb43775ae77795670c536d135904336. 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/0d26e34a-5211-4ab4-aac8-07f472fe7126.json and https://artists.proofprofile.net/proofs/artist/0d26e34a-5211-4ab4-aac8-07f472fe7126.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 0x13b3f1031e45628d07cdc5be70a272e1e064687ff05d7b6bcbf07ab0c508f95f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6N2009732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352115c7125c49cbb632835618108a9717bbeda259c4ba068fd0752527e8a66d. 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/QZMER2044933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e2e010499b25da16d042c42070779989e096b5b1af69ac64e7a974395f5a81. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ62122090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d86b088a3509d6692914facc8162fec85c2b77020adb3b5e86ec06b4bcbaa0. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZNWQ2279071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe79c51a030f582e1584ec09c6b8bab7c12e2fc35391885bfbe208e8bc8a2d030. 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/QZNWQ2279074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28942cde90b09f1b1a8d60f9acaa66cf895c26b6c980059cd0bcb1acfd6e8349. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWR2364153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038e554537f1a765d5142d018cd83e42d9e569815813042ceffc44dc5dda4ddb. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZWFQ2321831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67c2f2aef90faefce3f17aa4c9a2d324b8c0aebafc947214afd26c921341459d. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/QZFYY2450764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c327cf09202b6040326964ffc43b617f9c0af59642a40e9c10151f949a3302. 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/QZFYY2450767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40ec41976b6268cb093c8d29d83a1eb5b5a229d5d141dd6f301a1c49acd57c9. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZFYY2450769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739d306a44e66655a974a6ae699f06a72c3c7f8e0988aaeb5b1d8acdac8aa2d0. 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/GX7852401398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1c4951ce7c9a531eb1e505486d45c7a781e1dd5aadf6486cfd37b4b22e5f86. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/GX7852401397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9adf83c43350fd20f0e86cc3414ee865e62cf5941baa2f0d8a67197ef4753ee2. 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/FR10S2587317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a101681d4ba2653e0cf9b380c59f7b4485ccf85ed817d94488d58c8dd5c2fa3. 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/FR2X42511311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19004ac1f46dd2e6b5f2d011daa571ed22ac48784a4fdf1b8eb4b310a6a452d5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR2X42511324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fb83c1582326cb1a2db0625318e7e129f1055e30f587d5bcea330aae1d87784. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR2X42511326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509d17d58189f47c5bda7f78fdd6b7423579896e9bb9b160116adf2bc802d25f. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/FR2X42511330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206d51036db508431964251e71f97562e8c0b18137fe1a947e1b1967be3ba193. 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/FR2X42511332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7281c5f2a8d751ff83496c01dc0e26e6e27a20291e877ae188734c4c292c2b73. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/FR2X42511333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe926c9eb427de6d8c66c9376f5ac2dc4983e15c879c743fa1d1d9818b1ff470c. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/FR2X42511334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44880ab2dbc6f5a1cfe7d3641441f7668e24d52bf18ab56be90e768d9c1b8443. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/FR2X42511335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a532f4f8f35c829c6d5d27b785cd98a5414dda9020ab54b6ca43e1d6e14f0e. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/FR2X42511336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a31fd9bbff771824f724561f88336476eb110d7b6eda3993a7554d684762450. 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/FR2X42511337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x803f8f3b76b9ba065227df2562994e480ac2a3b3e842af36b59a978de895b85e. 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/FRX452519939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fb35d92d344d039b13f4b90d81360d20f35062522e349384750099f804c34b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FRX452519935.