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 0x93f1d69173aaa48c6336079f80cf4797ff5398309e21f77a2302a4a768f7d870. 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/29b667bf-5a9c-4519-9e9c-5f2e6b96d58d.json and https://artists.proofprofile.net/proofs/artist/29b667bf-5a9c-4519-9e9c-5f2e6b96d58d.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 0xf02a422ce7d689ddfb45568a09ef23c21c5f6329e4db499bf97e16aba6ca7eaf. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZWFH2379946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4831be447aed3296b25ca0da6533db8a9485eded870890bc72b5572b006883. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWQ2496023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0f2e2862d7fbd7b656997d6d25adaf3682bd289424198c1eeade69db9a7917. 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/QZWFP2403357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038b48b92c38f8336dee03b75b73994e5702b1bd39a45c3551b914128237d528. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFR2434455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16460ed5aaf3b6376b9988984a0c7efcd7d163a4ed9b7e819045969bfb273aac. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZWFU2452864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecf82515efc1d385bd8fbf9e569aa13e3df7492637e612f51a76297bdd85281a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ62572744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0f2e2862d7fbd7b656997d6d25adaf3682bd289424198c1eeade69db9a7917. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFP2403357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec47249a9f2bedb2ec21b4c45a39ae7d753c4d845d7053937e2091557774c39. 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/QZFZ62572749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe390fc42fb72e07ffcbe1c0a58a5d1678e0ac355bf9528834cc424175aebff29. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZHN32507303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa04e471465021a7ca894f02c7dae846348fba2abfeb8296b62a98617a6ab903. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZHN62568731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5ba7a2393f3343046eacc3a7419ae39da224c13bebd7013530caebc7e03fff. 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/QZHN82594894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d05598c424a800549535e80ec3b2bcc16420bf681c95d534e329c9e9734f85c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWT2501124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea9d85142d5039416f61894eadde3966e29b9de2f839d82106cdf5df5f584a9c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZPLR2590363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef7c4ccf69bed33744585de625e1dc4e90b0b951fb478a88a1dec475a498fcd. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZTAZ2576980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88aad41ee8c5dd601334418d74db444ed5854c1aa011b5518748de9fe274315f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZTB42579725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66801f6e00ddc8281ab672eea84f1ec47113647dd99a1934722ece82f096f35c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZTB72524374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262679526682008b0068a22f59802a58a18d41b78098f8a541b9542ede1567e9. 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/QZTBC2535966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcce735d490177458c1a383fe15172c7cea5dc5b9e3dab96186c9b811ebf4b87. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFU2587148.