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 0x34c2f3bf75ff50044f5c14961d0f714389e6dc92af2acbc8014bf2cc49710c84. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c55c25e-4acf-40e1-89cc-a2f2d7231743.json and https://artists.proofprofile.net/proofs/artist/9c55c25e-4acf-40e1-89cc-a2f2d7231743.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 0x63e80683538c1fc4ee009af77b80f712c4b2a95e1bbda4dc02aabcf033d8ae8a. 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/CA5KR1571671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eae8a144c1127462f826c3e00d53477e92187f5f76681c4347d70c83445c2f8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5530701346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dfa9b17667b2c415e2b763a91675de2d118c30b47e04cd68ed3aa3b7cc553f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ES5530701350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf675cfe9aca2902a11cefeab388dac93bf0bb522f65d0aeefcab5243649762ff. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/ES5530701351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9703a23bc890eff029b1ac3c134cee8a84fed3f8d0e63a46ed1f55ef2cdefad4. 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/ES5530701356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06011039fbcb3848d123c9dfbc24ff4ae0ccf5d8c3affb8d3be7cff115e0f3a2. 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/ES5530701358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab3093e7af2c9703718be19262e0933144ce1864ac102de59d111d69a05e056. 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/ES5530701359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00dcdc0cf041f0213704677ca43fbb0862cb1f1296620d04276aa1e05a2bed9. 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/ES5531104161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814fa53706666630eee91768580cc1fd3964604b1e1346cb79eb525acb27fe1c. 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/ES5531103844.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb46d9bb513f2a0074a65a6a72dc4f3d40ddf42c202e487cbb7e1a77e8e6016. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES5531007976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac81f9ec3260db67545cafbc7830444c8232689dcd8851cc6a695796164dec4. 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/ES5531224940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd981c0e08454ce11960b7422e9f1bc763683f56648b19ab2ef9eebcd2c6166a2. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ES5531222064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b602c625ad6849e8862fb40462d315c2e45dcf9572b09e148c7b4356e9144c3. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ES5531222087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6729e3087a345c2746889876201642d2c99ce8039658ef7e083c17f09526a9. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ES5531103298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac81f9ec3260db67545cafbc7830444c8232689dcd8851cc6a695796164dec4. 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/ES5531224940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e669f8c42221fe1a4d87137852bb12e8c7c6d8dc24a9767a5df91b88c0d3af8. 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/USA561234864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7972a8b0f80454fe400929cdf2ff789a07d2639def765be134fee36318ea7b. 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/CAM460434995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cf82fe92f9bae9797776c723154eeb946dcbb6d080f39269f11427ed11b804. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/USA561078336.