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 0xad57855fe519dff6fd581ab5bc5306cc210a9d134f2d4fa516ba6683f5c23232. 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/8aa7c7d5-6ae6-4ccd-b73f-bcde78eb62c8.json and https://artists.proofprofile.net/proofs/artist/8aa7c7d5-6ae6-4ccd-b73f-bcde78eb62c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x62a571ff6bb2cce86421c008f10cc87bcea1439505d504ff5db0e00da080b7e7. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/PLH492300978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd601b902cdb7f3025685d9b5cac1d1c565a8fad2f9e16de1b3cedec564a21a. 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/PLH492300979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b2ba5d77edaaa8c7dd0533c3da06c7c9f1dfcd3a2c025d0d6203359af61562. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/PLH492300980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8584069afe17880dd388c2b00c6998fc4e2df699b8a9224e2f9dcc65ce83efb5. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/PLH492300981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa25b8fa8b28c96d3cba49d27d8f97fdfea5f6042801f68dbb3bae8271ae683. Chain 2 (Bitcoin): anchored in block 956995 (2026-07-07T04:27:57Z), 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/PLH492300982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9efbdb107ef97cce3961edb36e542cfd2a9ebaee1271ee3c15af216aaa1089. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/PLH492300983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d5fd6b1fcb3e51d631044fdefda2d999c43a0fc739917a1721258fd61c015f. 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/PLH492300984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054f85cd74b140538d7ed3593cefbb8863eb552062674934c8d018685b8bc6a3. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLH492300985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a36ea60aa6e9e8763d6249cd2f360930237cdb4335d3df13dd4042015d2a00. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/PLH492300986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7739cc1634507f6c6a46161db25a930557aada543a1dbd89729eead574f91db2. 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/PLH492300987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1d80742557e3b3d574f41e63951543a57083cda52aef5e9495ccfd31e746a3. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/PLH492300988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1f1b9a891c8f1c40947d188f1ebaf354528097fe3175ba81228a459062c9ce. 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/PLH492300989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3fd316d12bb5ba0a5700a5bb3be550b5a6c8132640ace270945fcad6714d86. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLH492300990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fae132559d87112c40bacc83a74dddfbf674ae0bd2dd6d2a8a74006d037e34. 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/PLH492300991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a79214d7166827f508bc502441c2a587973668614c27642abfc72e38128ef5. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLH492300992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf018be2cbe3df1639d7f471c696ebeb04a37f8308464c8326b29fafa6041b8bc. 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/PLH492300993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0324f6d67b0ce0bb9d5b543104cdf295b7f2b150a9a693dad292506fbb092922. 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/PLH492300994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42bf269de375977ae45bb7732ec871d1973fd09611e63b6066837aa147e728e. 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/PLH492300995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb19a3338ffd1e6abfe5d77618c81e5244b5f937c8709833af8104ae553f960b3. 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/PLH492300996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa708ce469b6b22446d66a5b5ee133d2bcfc058a2fb05e3fc39da74d1f1ae066d. 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/PLH492300997.