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 0x6029e9aad5578ca655561a9f12b2abe32dc348c6c82759573e3bdbca0ceac510. 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/f5477a61-05e9-4296-b650-790a8017030d.json and https://artists.proofprofile.net/proofs/artist/f5477a61-05e9-4296-b650-790a8017030d.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 0xd9831d431904fbfbdc93e86e43bc439f46122190d755dcf2385e2a1f117b39b8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DENA52105081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d6ce9190dbf4907c0e892ed5c3b083fd6289f99f8efdde2a79a4569c891836. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DENA52105082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485a302ffc4a90b71e883d6467c3da78da7d63f4b2f57a91c7012229f9fdd0db. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DENA52105083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37dc3a8960121973b2a6df8e32c69c5371006101f47a0a87ef69d2dd59a5f7fc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DENA52105084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x570e3c1f2731455ff99ed08c62ee6ec5e441c47989a4e27ce72a267c43fb86b0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DENA52105085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe051b5242a16a93d5d226484be8fa7b10fb189be7caa02b9c96b72b81c624392. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/DENA52105086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3d37f600cb32e8ce7679b06c420cf6795a848e2036689bbb607eef74505a60. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DENA52105087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f0723a7c68cc0b3ac6a22660080bf7d8ec34642e27ab2fc45bce6793639e79e. 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/DENA52105088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4a33a41e7cdc85530b44585bb6361c21b6dfd3931104fd284bcd8e593d2a6b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DENA52105090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd946a056082a28216ac4ef1de61b12e6d7ad3ee3dc3eebf06a3db31138526a6d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DENA52105091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198b731cacfd4576145ee1134a72b533f6c4e1bc7f1d00041952a5343a03c7d4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DENA52411634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5e44230ae00b9dc08732507442348c6061af2f8e868caf0888bf1e93e9a03b. 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/DEGE92300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8769fd55f5630503c7634d7ffc8ef3ea4c8e9ca67e8f82a14e6f198855dad61. 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/DEGE92300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4203d5f8d36c6f35d260c917aca747e6d47690222f9bafc136fc20a2c5dd7b30. 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/DEGE92300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc62e24a29f56d2dfde0fed71d8c6645731a4df152ea173761f4abc05c7c9d4e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEGE92300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a88ee6961c1ec4649e9f4a2ec6ac086999e584b4a2c20f461b959fe6357615a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DENA52105353.