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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 0x7a3366f8672e49e47516f08219f838d58c41bba3556191ead7cd244172b76bc4. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b31bf421-80a6-4e9b-b282-42699a73ac78.json and https://artists.proofprofile.net/proofs/artist/b31bf421-80a6-4e9b-b282-42699a73ac78.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 0x3bbf0c34f8ec19eff8a5098b5139cee33e102172522220628b90b48ad644c9df. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZNJX2304292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x714ad8433e02f5c6f240da5a27216ada3aede27cb8f7dd43e969042336368861. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZMZ92146081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d57f76ec7db8fa5ff667553cf2ebd9c449d6500f283902e497678d5b72d38d. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZHNB2058918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324e0ace9412be94e5304b6a3ff25adcc3a7125ca8026e8d7ece53124cd8b7b5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QMFMF2416069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c58c80d1ce3fd35c2cff35a5ad8e2a94585954cdc4d388be3d0df909e28f2a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QMFMF2416074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897a6c1dc9ce4e19cff0c7bbdbf4690be471992921e5e270dd035ec878044b36. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFMF2416062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc122e8faed2fc53ef58acd4a330e44626bae649922c8bf950354db33a48356. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QMFMF2416063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3e82a735178a5c8cb7fcaf4b6a20ae36a927036e6ce34630051b386d6625f9. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QMFMF2416064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabaed99aa2910a2ef8cbba3eec39b9b2ee15eae6853517029e20e4be5b7b973. 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/QMFMF2416065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb019103384508438d3991943ee3ad38937818741f7ccd0fa3db38a50a89b991a. 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/QMFMF2416066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d12b57347dde9803c5137d8374ef1664af915020883991057513a1a593e4061. 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/QMFMF2416067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7a7321718ce4fceabd2a58d9d9740c6784ea0493b6effa3c4663a43a7fc6d9. 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/QMFMF2416068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1b0fa83dfa25d9f5a5d89d7a0175fa860ba75919db57f4998883a50813d345. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES75E2303328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d6867047e2a77edcbdbf5866fa8c0646f9a0d2e0691a80624e5cfebe366d43. 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/QZNJZ2203386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61396557779ce137f61b163f1e7f4733de79c3f955180657b3314ab3e2ff4c00. 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/ES75E2302074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36082bd2aea3885cb7f4e31dee6e77d274ecbf3d1d98259ed7c3b1292efed98d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ES75E2303330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6dbfd60ba407dfde2c185fbe8a2eb9b82ef86b8f3035288136da5f69dee2e88. 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/ES75E2301271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb1b382515ca71e353d1358d8b578d2170628bc59dc032c92c403980cacf6d1. 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/ES75E2303335.