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 0xc896a30303dbe85e836c161cbea407971751a16d885bdf0d1eba4f6c8200162b. 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/2b206142-a6a6-47d8-ba59-a810224be73b.json and https://artists.proofprofile.net/proofs/artist/2b206142-a6a6-47d8-ba59-a810224be73b.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 0x8e9d34f06f2f753da151db1b17f81160cc8fd10b607c93f898125f0be90cdaea. 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/QZW9N2222895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795edc25837432da05e19cd0230200482227c880191e23033e2fbd3f88073410. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/BKEHX2400017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20873fec4174a48e2ad4c03c50bf649041e6389989d05265e6f0564dc6a72fa7. 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/BKWHI2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc8fe6f8caff68f505161f453e9f64d108600d36688d44bda57bc9ece24d9508. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BKEHX2500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f70417a8feb3d906e3564051b48ea3698e22be837662d0321a169ba2eccb3a7. 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/BKEHX2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dcdb1f3381fa025499a39e6eaa9f095c0660401450f7486ddd0de33b0c2578. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:41:45Z), 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/BKEHX2500021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc438f87155338ffe72cd8e8a2c614295c218b409ad90bc2765c26faa56536d69. 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/BKEHX2500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee31edabbd0d575e6ace13b688c3a3139c875e3dbe84e879e3c339b9cb5e7144. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/BKEHX2500023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213df6266ed7fa7f6193e9794e2a85fbb81fd361ae7a6d77e9f958dd1b9cbb9e. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/BKEHX2500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337ae92ea120eb0dc411adac3f3f95c07b5f4d81972720496640b33e2fa8c1ff. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:03:02Z), 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/BKEHX2500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2fb2386ae980637bafdb0d82c556f8105fba2cdd7dce0c8f8aa0d03b8475dd. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/BKEHX2500026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765ec751a41d0f5de776ff5808eeff7ce5461436e3a06fa1184a51a8ecd12562. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/BKEHX2500028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d8937976295225517ad693357916dae6490f28079f06016a53ac905f62826ff. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BKEHX2500029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab7733bdc8512ac1e8ec37e4d16e6caa7d7f4ac5d9a1da9da481d8028724e328. 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/BKEHX2500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed8e4b88fd9cabea76b624064c3b8deb89fb0797a7936175a86cd85bed72fcb. 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/BC1U32201218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d84b5171e928337a9d993ce7fc8a1e46b63262340e19ac3b2ad4d50dfdabcb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BRTRB2303227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7bfb9c763efff64e3d1d624e973216da8ab974dce4fbe3017c3f9e28b693392. 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/BRTRB2303228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3030770ec5da170bbdfcff9d529d91e817d5daf3637c6fd3e31a65b6eca3a3. 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/BKEHX2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e67a31f174b17f460161632751a0973a58deaf818332d51bfba75f983303922. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7VG2591899.