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 0xcd192bfa13202ae480dc6f2bea456f94332789df040dfaaa1e88a28519e6ee26. 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/25ccb18e-aa34-473c-9283-902bae837b47.json and https://artists.proofprofile.net/proofs/artist/25ccb18e-aa34-473c-9283-902bae837b47.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 0xd284c18ac4f99d089ad90cfb5a13766452dab12214b3aaa7a1c07c083ef373e5. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZNWQ2290443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db23e3be3a0ebc1d79f6e699f1b52e9a8f5b622b6b507c1c0878de607454f87. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QZDA82397116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fcb94dc6d0d661441c5d675091de1c3d31bbb8a85d095455304e46b9aa8184. Chain 2 (Bitcoin): anchored in block 958680 (2026-07-19T06:04:14Z), 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/QZHN52314963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3868859dbd4e08adc294bb75cbdbfd05c2649428b6e7203c44b35c55e0dc2bcc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB52305291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2138becd98db96fb04f5c8f8c167ca0d9c520dae8d0ea6eba0db6b73c65e23f6. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB52305293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cc8c92fafcba54dd25e1934e07bbebf221874887c7f6dcd155667de756495a. 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/QZTB92399692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cc8c92fafcba54dd25e1934e07bbebf221874887c7f6dcd155667de756495a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTB92399692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a2324c360e1e9aab770ce289d6775a935d86f91d2b27a52522778e11d57ff4. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZWFJ2348452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a2324c360e1e9aab770ce289d6775a935d86f91d2b27a52522778e11d57ff4. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZWFJ2348452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e08a15cae4ff4edbfb2a532197d91a9c3606c7910d1abce82bbb594f7dbeab. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZDA42439702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d559a4b980c8a37cc23bd1894939744876d1b9e3e7fe26ff1d75b1727d13438. 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/QZMEN2415128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de24676d20396abfee74513aaaa8ef35b57a786ae610f38cbd4ca48424453f0. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZWFU2480396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f3742e7a236eeb4198536b6e13a4045523b0066b574247cdc7824f0d3a1b64. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZFYY2545505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f3742e7a236eeb4198536b6e13a4045523b0066b574247cdc7824f0d3a1b64. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZFYY2545505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79590c6dc9b69a83a3d91fd42b89bb699166d99d9e722339d659abc8dcff9a75. 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/QZWFG2498343.