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 0x3980c153f196bb6245140f246405ac9589df050d529aa8fabd7cc7472e6eb3de. 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/1017aa6a-d37e-440d-a20e-010f8ea4205d.json and https://artists.proofprofile.net/proofs/artist/1017aa6a-d37e-440d-a20e-010f8ea4205d.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 0xd2d0f5e98db2729deecfa81947e248af63d7d7d7b0e76149cb51633e848605be. 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/QZES61907701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ba3f255ac5a1e49737754bf90510b11a994639eadc97aacc65cc7cfb9fa566. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6Q1965331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee1d4d971d13261851c8c38297ba431f6d0372615bc4d8714dc209548ae9bb4. 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/QZDA52045678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbef4bb9486e0f6044d69e851828763a33a41ef52a9bb5a0fab40aaf38be72a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA52045680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172b932834ebd4488015c9d19088eba3086965deabb9831d69918f7009a927df. 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/QZDA52045681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba102e411154c11d740ff8e2065c3936ba85140319addb2ff569882953de68a8. 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/QZDA52045682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2e5d8bc4e0f5fcc247a62482b7d5c855256130cd87b2004771031206a7252b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA52045684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14e85e466f56186bf3f91b09108245da7d97615b79350bea2e918deafb8ca13. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZDA52045685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1076fe24e3375fddbcf3e0ceb38687dc198a751f03315e8a257071485824f61. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZDA52045688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a80cb746c03b06d0a2ebb0ca80a941d592453864bbcb0fe642bfec46e25f222. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZDA52045690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b4d06cb7d984e65fa7a7cf2cd9c747814ec380e86c366cccefe567995b96d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZDA52045691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78819528324baee2a243726b59abec86d78348321d7cadd513c6046057596e6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6F2096199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd323a2c4a026ade03a9144c2e22b9e8213bfbb912c59e5cd4700ff7706e2d392. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZPLR2037170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af40a68b0df562b847413b611b88c5b42727a72c09598932a8646039b150dcd. 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/QZHN42320625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fb2a8561b0afc54ac62304399179e93e723a24488825fec912239480e771a48. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZHN42320630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0d81b1063a49bc87a8912861c9797c49247f6fc100d266009cc65ea6dca06c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA2P2501773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb678ca3b6b9e88ea885391208251de2c9d617be614943795ca664b1c24386a0b. 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/QZFYY2256953.