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 0xda009ec9432bab6c7141079d7bb23649ca37f2cc98caa773a68ac6e6b4ccfdac. 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/0b3a8c25-8e67-475e-a506-8a5330a8bb08.json and https://artists.proofprofile.net/proofs/artist/0b3a8c25-8e67-475e-a506-8a5330a8bb08.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 0x8ef98ade12cb7aad505412e3533a07142e89e48d2f771989a1ce79cdb739d9f5. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USI4R0402581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d885893fa0ce2a6f0a4b6bf9010643f920b1f0109bfdc230677fa6a471b521. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USI4R0402585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe01a14cdddb14047a86c3af7f5d15ad9735b8156b62b647684d9a3c31b15a84. 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/USI4R0402748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2172ab9f24f8f680d743e7758137e970aa7c9e53d0a134cec2b2ae4074d1917. 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/USI4R0402749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5223dbef2389edca453880b88c83454d3cab2cb6138f12556fea267a9738df07. 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/USI4R0402750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b997319e3f56cf6adbf0888eb149a7c6d7cb311acf4f676b0899adfd5cead0. 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/USI4R0402751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920f8ed419a9ee79704dc29031fc0b9fe9e7b64481c1c8494cb492b8ac5991d5. 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/USI4R0402752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a18fb98fa26772c1876df5400f65eba11ba45b7c243d970d68d3e37637219c. 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/USI4R0402754.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a13956e1d58ce43afbee8d726b0406394b4991c6ae49d0676b65f4f45e7594. 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/USI4R0815803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389b1e7c09ad3e4765d715ab2d576432b9cdecddac7f90a73d23ec342e85524a. 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/USI4R0402582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa8b3288b3ee6296b163ce7cdca738c51f833831bcd4a8e57178109417d580d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/USI4R0815838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a13956e1d58ce43afbee8d726b0406394b4991c6ae49d0676b65f4f45e7594. 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/USI4R0815803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1d37a934888571d73ef7be106cbcd0bae15f5f3acccdc24ed60cea780874b6. 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/USI4R1021096.