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 0x290f44693b9dfd646e505a4066e7392c6e35bc0287c9aec4f3628cd220f381e2. 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/9eb57305-ee2f-42b6-ba0b-ad4a8f48366a.json and https://artists.proofprofile.net/proofs/artist/9eb57305-ee2f-42b6-ba0b-ad4a8f48366a.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 0xa3d10cb5e09257d6812a8de51c782a71f0dc53f29882983a20fcf2c0a6a10d27. 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/USHM91633099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215a1082eab9171351bb21cd64434544c6e97a890b13675f254f88beac7ded3a. 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/USHM91633100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860eb0870a3065e83aaf039f74172bfa128368b29a3b5342341e0b38dd936ef6. 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/USHM91633101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe039fa3c8702059b99a3bfc30fe255453eb2ec234bbec0fc517d0173b0669b2d. 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/USHM91633102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4762482728eb0d69dadf6dd743f135f4b6e3b0ffdf2923c322776b962da4aeb. 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/USHM91633103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89fbc2b920e0221b78bfe2e5d6175d27513e1fb14791b070a3a3a94887b6523. 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/USHM91633104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc399441f6fbaba9861a736342e8cf3ef3972b27bf3308a95763f545903bde9ff. 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/USHM91633105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76916f95422b2c5293c07521a9d8484f539a3580255d0eed59e590c3dca1784. 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/USHM91633106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b61d3c93caddf9cc27b8af51dd93ec3eff820322c4c25bc793823393d904f17. 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/USHM91633107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8a7b7ef8439c3bd984e694c538edcceafaaaee31214eed2564038393fea8aa9. 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/USHM91633108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bc42306aaeb0021b963c5eab018487ca3e58d4710112e017c2b872f55eee8e. 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/USHM91633110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cc4d9968c19faca1ca47a6ec41907c1bea5f1ae0ca1196f2fd5481716a59c3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:08:37Z), 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/ESA011802199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be45084e9ce2b425204f25e83b12b3d6a8dd7adb157709bf5bf7af7de430ab4. 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/ESA011801974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006d7e197bad32b84e022d02eabde42f27dbb21729816f7c4920da4ea8a7b209. 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/ESA011717240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bcf273cae0dfc59c1ed18ba3cbed02005e883ca9baedf1f9f928c2482f56fe. 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/ESA011710572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5f5242324062a13f6ec17f7fd8b1786d404c5986ffb58653d8a8b9a46781a5. 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/ESA011995943.