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 0x5807eb0915c7ee9c072e210b003a0892a629f489593be3e26414d91aa151b313. 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/49546273-3293-4b81-8dd2-1168c2ea7c5c.json and https://artists.proofprofile.net/proofs/artist/49546273-3293-4b81-8dd2-1168c2ea7c5c.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 0x6b3e1bd710f40ba058e6c6d99aa2089c7ea151b62338dfaae80b1f691ce8531c. 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/USE7D2100395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdc63c1a305179f61a47e16c2ab79fe07e2a2e08a0b9d017d303cedc37eeabcd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USE7D2100384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x795a1f595e00f4b35c30e103600e723f3e4b2662455e8a4a1518f54e4f5121ea. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USE7D2100373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f89a9bf28ec5df793a08c9088d49e5e925ccef24746f2ce710b7d5fc5b7b7e7. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/USE7D2100355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f55df0bca0ba83b721d0cda401aa1953bbe9871baa32c73cdd30a809f8c403. 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/USE7D2100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407ccc0e5bc5c41ae4ce8b372bb9e513abf7b0b2ae679364eaee73dfaaf027d0. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USE7D2100196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae1ba485881d4aa38d28820b086579cabcde92641c2ba699a23dd95a6306f68. 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/USE7D2100195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6adad28e56f339c3ac0f83ba37d4c721fc4905273c26e3581454a2b846b2bf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USE7D2100334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f55df0bca0ba83b721d0cda401aa1953bbe9871baa32c73cdd30a809f8c403. 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/USE7D2100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fe3c08b53afa9f97992a13cbc84dec545d2873b2627bf32971c43d87248c8f. 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/USE7D2100335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb60b82e6803e8d7f5fcde0c7326c80d9c203ac25fb0794eae05f272dd08ea6. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/USE7D2100336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263e08bf4f7557a83a8af0065e9e785f8a52a3d3fc8f7a48f9962cdd20185c24. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USE7D2100337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a0043984a538a62838d037576d97677ac14a9fbd5d9df91f1a6c6fad4335ce. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USE7D2100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519b63a2b29d031f077f7bda8e71bdac94eb334606659fa4a80d63d7dd855e91. 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/USE7D2100339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe96e323173cac1d3346e72c009c6f5225ed2775d92da03f9d05046b98ffae27e. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USE7D2100340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20dcd8de8f43c90d05fff398f58c34339f7bc6c951c56905288235ddd91d15d6. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/USE7D2100341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355b3d8d330c9f31fd360224375d1af31728f627cd67eb30991f020ca6d53eeb. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USE7D2100342.