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 0x5386e4771cfe360e18baa7066d150b99be66d3ae6a864d6a84ffea9c2fc38f8e. 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/c0b06d89-740a-4823-93ff-8ba52bcf4685.json and https://artists.proofprofile.net/proofs/artist/c0b06d89-740a-4823-93ff-8ba52bcf4685.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 0xe6819989700cc4dfa5a80cc89eb4579abd83edb8059ca8b3a3c6305e4300eaf3. 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/ITK7C2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fa2c2d3699cff830c4793ddd4f7f88cf2415eecbdc88c84c9e568ecc66d736. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/ITK7C2100450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc3526751f6c5ea99903141dc381d94b2cd45b538e82a72d04cc304255b627a. 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/ITK7C2100470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b2985e5833b00480070c72a2f60cd27160436fd0ec825e90dc56263820ca11. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ITK7C2100570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c26123eb77baaef9c8d8e82f6b5a75bdff6fc8b738c6f6008248f1e2ea8492b. 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/ITK7C2200260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bad7c931203e86f3575d50009a6e4d8ff66f303f7aedbb47f7a1300bb748921. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ITK7C2300300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2df5f8702c06ee69857076decf98b526850e4a698fb7cb3864da9a2e7a6cf97. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/ITK7C2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc6f10726fa74100af2d6570f7f38c610b604a869c988aad1ef03ab7c29b342. 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/ITK7C2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c72085cb3fc7b5bbaf2ccfe21aff950f007a94755c21d5da6bde203fb62397. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/ITK7C2100871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8482d3a2dd653e0625fea804bedeb747177495ac4d2d05b4d5b3ba3df7ed35ee. 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/ITK7C2200090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9726ddb5d03f66d4d0d6494e53b732e9f38763d77adfa4f281b68a303078231. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/ITK7C2500070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cbfeb8fefd942ea4a0b00fa6f3994dda853fcd0de28dbe9aa64e973a44dc504. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/ITK7C2500080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc684cff74efcc56bc30e646ce53d78897c470d789c111ebbc7031bcd48098c11. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/ITK7C2500120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x334a4521b80a30c4230439c3431d8c6f0971080f72a58a583684cca772c83c32. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ITK7C2500090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01f566f5b8ab8d8309e644c68f750e721558c43556aeb4a5639bbea3c507d15. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/ITK7C2500130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d7e0e0d9d85dec0d11861052d4a30519b26fc07c5e4b18775beeb1774ce68f. 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/ITK7C2500110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed8b6afb2881c06e28b206da262cd3951c474b43c8fda1687a7c7737718ea1c. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/ITK7C2500150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf454adae5fabf58bdddc56198189916f843646d45289bcec4ccf1377f9d94f. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ITK7C2500390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756be87acf01cc0ee32dddf83688dab3c44da402d682513966dbccfb20a13566. 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/ITK7C2500400.