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 0x892fb9579f13f768eca73c5ac12f36a04e35ab92ae20279248dd5fb26d94591d. 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/affb1186-c9c8-4f7f-89cb-e3381d97bb23.json and https://artists.proofprofile.net/proofs/artist/affb1186-c9c8-4f7f-89cb-e3381d97bb23.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 0x7485d5a76554eb74ddf7ce32595a6402f74520b721b1dfc10687834a20b87ac3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DELJ81616573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e62a757c6f1c23f536e80563c1ccb373168acc9f0063d6153b1366c2a28b764. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/CH7811713178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9deb4ab18784a56b19454bcd88bc3ba26e3c794c719fed02731637a0a648c7a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CH7811933827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84ed0dfd73982ec6956e3656ef859b7ae55bffc2f4f075bcf2107ffdebce5f2. 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/CH7811933828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5944296b7da52efdaeae162f3eb2bbcdf9869d9eb509a8b7812ecb3b21e2fe20. 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/CH7811933829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6015cc54391be62fd0a68a5523ceb838da7bd200fe641862571bbc3b098613ee. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH7811933835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fafa0830ac45f91ee41d18551397b11b7e245add5d6763f191fdff5ad820ce1. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH7811933837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87abcffb16c39019fb15363d95700583803a5f9cfeae1eb5f4c63cbb5ade2a46. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T05:21:00Z), 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/CH7811933838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9886e7d8aeeaa18cd3faa167e7914445ffd80fbd4a15144c0fbd09ca6f0b899e. 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/CH7811933839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30c889517d74f0a4db8df5c99fab905d680b931d34386a9220c732d76c5e6b5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:16Z), 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/CH7812198429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa62bd961e988ed06137c76e9db7500c69e015c4ae2d3800f07f94ae9007de71. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-16T00:31:49Z), 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/CH7812108987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0adcdbf0003ac05fb57c6703582e17244993a314d33f24a4aa98be2e53d07c03. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CH7812213950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68d84cf46f84b5a528d013073635fd22eeb3337af6a93a208296244dfe18037. 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/CH7812421661.