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 0x7f6cefb7b7925699b6a2abd87fe45ede2eb3d2d91e23b8371175499005037e1e. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed144f8a-a74b-44a2-8fc1-75fbc0a979a1.json and https://artists.proofprofile.net/proofs/artist/ed144f8a-a74b-44a2-8fc1-75fbc0a979a1.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 0x2b73513c230b0a42c989d374a366c1bf22c5dd4d6fa91786b4028036d1b8286b. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ATHK52000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd2815e3b8338ebfd3cb95052860278e0f8a0f1e43b3818fcd44f2ab7e103bec. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ATHK52000105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6625315af8794e084f02121a4e686e1913c5280f55dcba0132f632a96e400411. 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/ATHK52000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693566b505b6b9d04df24b7fe381b70385ee70e1a55bec20ffacca0017323ecd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ATHK52100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a54b5c6901c55ba63c58bbbbd97dee95f2f9bea0564bc6283f2097531e3ec7e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ATHK52100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55c99b0c45365b6d7151624b3f7a8a622e51e56502638f8c9250d9e244ccf42. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ATHK52100112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81eb70fe6cc4fe06685e6b3a4e4fe3d43d2b1971752bcf246137c4d0dcd5a240. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ22261343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134bcf9a4f18b84b9e8061eb1398d6c16e552faad808803bf5979245b5e00489. 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/ATHK52302001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55db8d867b1fa9f26c4b9969016970d23916c607eb94ee1d647a024949b1feaf. 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/ATHK52302301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9925b5956d824528736575d4eea73219d72f31abe7ae18a984de5c24a5e644c8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ATHK51800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2852c6098411a6af7e373ca236fc744857a68363af98c99c83b5c6436a2883d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ATHK51800204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62b9b3af9e3798b04a5fe54a3f91e821abd033596f5d50c70d0adb006635738. 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/ATHK51800205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebce5113f43afe1846f0f73646801aa10113c0d3f512a42282295d4814f8d851. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ATHK51800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51426b6a9481f80dcdbd05eaf2366856c5d909c588c8207aae0ee4d2a61d06fe. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ATHK51800212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c2db09d615aebe06c630a20673f9f228e036881c1319d8b45ff170afeb2dd1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ATHK51800213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f30ab87b46f6093478dc2f4d35addeaeda46d6d764c7663086b50c5405e28f. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ATHK52100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d812677e19931e6863cfad01e68611d7618a44e22101192f526a6d4af708f87. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ATHK52100309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c9c72259ee3fa9bfd6fde0132e68a66fa80e154efe9c67e00d34692a31db96. 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/ATHK52100310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf467e2cb474f069fd8bc81cfb93a7a0906261a3de81f09a68af110a6bb9ed39b. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZHN32093238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05cffbf021d2943b4d2403df381bc80fadf5fc22221bba57d33929055c22b9f4. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ATU332011102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76b5dcc84c88629d96a58c2470e62aa2d019f34043c3dc9374f923cd1e52d94. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/ATU332011110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd821a21992f89d36f49135abd4b149f1cfdc83883d93c4ee8dec3d61fa591709. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ42357348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433b8927f2a55727dc89eb923c615373d78a38f70c108d679f0b1f01b3b62e6c. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZPLS2142586.