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 0xadf7d9bf359cec99547e595a91fc44f0f79b10565d975487d972768548ce60ef. 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/2ab4c33f-4036-4c45-9931-2d6c3293134c.json and https://artists.proofprofile.net/proofs/artist/2ab4c33f-4036-4c45-9931-2d6c3293134c.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 0x3f5a821219f87c2978b12239439774dbe87dba2a1682ddc0f8935e59a30db54e. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZNRS2040388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2358cf71aba0727dceb568d50803f9c41aa753eaf011d11753bcf3e39e74bc0d. 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/QZH5E2182950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053a815b6e7f6798c3fa544e27face5a18c068ac4f5a6d7b4d7faabd71de0209. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZWDE2228489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac9206ff3fd216124b4d22ee0304c04b5770a0c2f269c4632e9d148b4aa0dbed. 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/QZ5FN2339210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ece512984c2947a0533a39d514e658ae3953ed41766e1e98aac0815a6e0040. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USLZJ2376431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08cf085f8d2d2cecac8e83d38ef9ad6c28ec136610ededee061e237487a3728. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GBWUL2396547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe243b997aef8de19fe8ac473bc44cb3ae6f9c23667ca9271edf0e4440f752db9. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZTRX2363570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1c3fe2858f564b6cd66f2050b22a73718dd2c7baa7b69d84a2c260665470cb. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZWDD2334781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f49f5393fcb195d1912e41f5f1206e90625a45589e4b7429b5bdaeb02a67582. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZWDE2360233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a94c09c4b0ed789de662d26b8af9896b09f4e168776db8600677fa2bb0b69e. 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/QZWDE2360236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866e3780a9a7557840f81af48f72f82eb75b34934c15c230262abc49123de173. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWV32449480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481e9081ff46d61dd8290c9c724bf89b68bd0c6a5fe2161533e56cb17d9af42e. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTV32409391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf04101b318461c765f5bdae912245982475652fe326e5bed879ce3febce636. 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/GBRKQ2490143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda090561f40a8ddcd805037ea855d283d379e140c9fb09caa6a0990de0c5ff4b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZES92548062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1847eae9f3a70c60c174fb84be6b09fc3a7b9030a1d2845a6f9ef301f3ef1bef. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/QZQAY2504462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a3d7df7c0a687fc19ee88c5d3595153266ee9048a9ea7aa1639265c1efff68. 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/QZS7J2513143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dcd25dba542a5d1545ce86b75a64cb31ea2cac8ff41ace15f24e51acd12d27. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZNWW2463709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab80a35d67377fa256e049d63b260a8ccab47396ac0fab4ce000d51400e3ee9. 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/QZNWW2463710.