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 0xdd3a69b7087265db1371e232932ea328fc453ae994d9a2b8ea29c4bef6d16baa. 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/33a23f69-14cf-4d7a-98c6-c66d5980967a.json and https://artists.proofprofile.net/proofs/artist/33a23f69-14cf-4d7a-98c6-c66d5980967a.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 0xbe243c1e178a433bf69bcd49e6989569e44649500ce0bff79b0ab3fbd7d57484. 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/NLAM41800060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f42452bff7d4ca6bc430aeeaec4609e0faf1c4e2a9a67f81b90d6b62ed0799. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/NLAM42000163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf940b7e96022f475d3f694f8454979a430456d5c0e4358f0411986c581126cc8. 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/NLAM42000239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0a36d2a77bc5f25a4c10454263776f103adfac914a8a255bd9c1fa42491107. 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/NLAM42100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c5640f0b66206668ef2787e6ef80b33fef343ab7da3483bb928be7f0344afe. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/NLAM42100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69962fe02085e9d98bdb370d8c6c6cc8582f9c53ab72daa1008b366383d44deb. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLAM42100081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3851dc205e97529e1b14b8171523312f6b6ea84726457ee03e1b26a5a3025b8a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLAM42000262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507aac0457590950167d7fb982b511accab3786ed4e9e0547d7ba8b8417310af. 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/NLAM42100176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa715b314889f29b2e4aa220ffc50827e6c54fb2bbfc7e7bfb3a558810229ca62. 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/NLAM42200018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dcc8d4bc382ab8cdbc278a7a764e2ec8649f9836bb8faa4042e0d110de5b08. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLAM42200115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba7c056f1efabed4730adda802d47ad85d9e62ce20750ffe77bcc8283d5b0ec. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/NLAM42300272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644418a7cc6f37d7632441ce5c2a8dcc9be160e4d89812a655db07355db38ae3. 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/NLAM42300256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5437c595a897bc3f49a2ee1bc7ce8b9a7a4eae564fc32047af00c4c3b1cac4. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/NLAM42300368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8ce5fc025804686ce1dab5d0136c4334a0ae47e0c88bd067682c85122b74d0. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/NLAM42400124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0ee9b8bdd6c261d6a9dbe56ed7ce964ae27c77ffcd1573105ca8d50f20ee5e. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/NLAM42400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b329b4836b13cf1566b3b2ef250a08dcb84bc83369db9a076d704c7f5a459a3. 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/NLAM42500175.