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 0xb46ba074f08f074dac89927d65dc9e0885c5be0c7395b6b7e984415ee9c6c890. 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/4c1c5eed-e73b-4e08-9739-57801541266b.json and https://artists.proofprofile.net/proofs/artist/4c1c5eed-e73b-4e08-9739-57801541266b.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 0x879bfb558e1178de3da6d0af0eea6406a2d6525d0666e6515200cd7912aa25ac. 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/QZDA52211351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x142efc1dbc0b280f3ed8e1eb7a00891c9b0689e3c46e88ecdc2f6c10bc2ab079. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZHN72286105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6bf146415476dfb93cb435b58a372d7dcb8fa349758f0cfea34fc069089bf0e. 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/QZK6Q2295534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8be02db7a750a5d381d850430ec9d92838cbcc0faabb24a0be917501be55d9a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6H2235760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5069b860d6b125efd9baeb22b4ea58d895183eb26998f1ead8e08c72c731b6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZNWZ2247967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee79bb552565a8965f874679af3af1b3dcbfd13114386ba7d318688df4b0d16. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:24:44Z), 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/QZFYY2316890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fd28123e3141571dfd2e393eafbc7735e2ff2bbfc9239964c10ed3764e4d39. 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/QZFYX2371155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea61a8468a64454fe46781e2041fc7476a5a41dce8d8874a11eb7ce752177d44. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/QZNWT2499722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973e0fcbe81126a52f44617a46c6370625595999dced9ef592223c4604d340d4. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZTAS2444651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66c6bf73dc410faafb19f8efc51c9f6dbcb093ad0131ac8c963e41032cc5ec3. 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/QZWFR2407493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8aa39fbd1f70cc64b098a4680fe272d61daf6ce4bd3e18df49139f398656a4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZZ792470825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fa69d69dd4eb8d321e38f3b47b07be3322ac761389bea3c018d71c3c88330a. 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/QZZ7T2492185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094022316680ebf2dca25e3cfae8d93ca8711799185fb6d2b8140521a27cae94. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZES82505639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721fae0493126cada022a0be1770dc4f2af5a7a6a97a8a3eaf228b53aec78b6c. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZES72593610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf067052bf0497c2f292ed65c970c6386fb35240f01c30563461567b28299e8. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAW2526576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444af47f3a18ad584d2be6b279516a410f4703e4761250de79483fff2348e4f7. 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/QZTAX2527484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a79762c615e179c7bd8eb7423999cf5a1cd95240b16e208b6f390b4cb89016. 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/QZWFE2562439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe06a29d0b842cdd84dc55e4aef3d95dc1fc6e05c9531b7dcad546c17f03f8a9. 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/QZFYZ2352126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6a1865fcb0717fe6dd1c398796666fb9d8d398a13bf2710f8df0957fc335e8. 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/QZDA52390654.