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 0x093e2115dede4c505ed1f4ba5c77f77257aaec9a264510a47a979300ba5fe55d. 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/e283566c-dc5d-4026-88d5-16e124a3fe91.json and https://artists.proofprofile.net/proofs/artist/e283566c-dc5d-4026-88d5-16e124a3fe91.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 0x1e9680f8fdbe2fe5003f1dc70e6f4b101df69e79f6f957e9b42c5a52ebc2f640. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/TCADQ1893387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4194a0bfca43ca843686d1ae07f045717e167fbf820be3b62f6e9ed82ff20f11. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/TCADQ1893420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9ca3227dab9eda993709c3345e472d6f4e4c6e5fec1033a2668c110bd35466. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/TCADQ1893537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da5b4b757f19aa4768dfff446aac2ff0771afe655afd6833e2824fc21b50dd4. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCADQ1893629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba9936a0622e663e7f943e2811555947787b8cb865b7ce54dd16157c475fbe5. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCADQ1893638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37b511721bd8a4339a7da6e23fee0e50c62b597c9122f51e02ab4d23df360d9. Chain 2 (Bitcoin): anchored in block 957556 (2026-07-11T11:14:07Z), 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/TCADQ1893671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf278aa2242db1c0a62777789163af612b5cbcb0fbbd32a27cc8ad660d312e8. 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/TCADR1806016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5a1bc918e093c0b40bfda172bf14b926de3caaab6311950d84ef63a82663ba. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADR1806018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf57d227179543c252f80abf9d8dcb6ed9cdd0fbbf78d328e0792c14acba13fe9. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/TCADR1806019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06efda80e81a5539558bc21e87c8e0728d672a93d02ceffc54cf7908a04a1098. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TCAFJ2152412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe327de21fca4a8dedb5801b06be004507cf478c86cc29d97a384a1584d854ffb. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/TCAFJ2152572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a26d764a11fa4ee15c946964b19e53d5f65d67c4e9dcdd4e792c720ee45f79b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCAFJ2152452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f8633d8df173d5f9dfe458c085c6e2d37bb64d0867ae2afb780e808d1925c3. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAFJ2152433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaabfbf2f31cb4c40e462d08f21f96858b9abfae055c38ae940bfc95ee3c5affa. 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/TCAFG2002257.