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 0x84875d4770b5941a92e955337acb50bf5bec46178505aedb31ffab933c838ac6. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c7a3522-b265-4415-87b0-6623925ac9d8.json and https://artists.proofprofile.net/proofs/artist/3c7a3522-b265-4415-87b0-6623925ac9d8.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 0x07350b9260a15a3c931c3fe197ff7281cce6ed3082479ffbd7d8c4ffcb5d8f5a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZHN92122663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f495a9bd7c4945c8ddb556596f40f154476514224a75372b74630be28077a5. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZHN92147648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c06bc66f3fe388969e5ae191ff3e8e426aa98c75e965f6ce8871ef7349fbf5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZK6N2104189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb847e424275052c4bf0bc57eae50d02e5246d40b2b25ba1bffdc0a9579316c6e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZK6N2104193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e9873f17c5f268b3cd92b4beba3a58bf5c939aa3803d98c2b0595a17ac74ce. 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/QZES91988219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37bdab41e496829ea4acee6a628c3c473573f0c6bfd433e2d04347074e8e980c. 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/QZES91988220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f8919afdb1d0968e5691f6f4ac210e77b3a6f3c05b4a6e329b76253769958c. 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/QZES91988221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4414f93938f129c0738a286496096cd17db0d524b839e05115eea8f8355ee3. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZES91988222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf8ea21c0565fcddea73ae0120b9e9468dafdfb9b839b963daf9b1e81b3b579. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES91988223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00b841ae22f6631610e4c7ff6428cc45f37e3a054a80f2974744cca271e93d6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZES91988224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8bef5697f49c9467e536c8814c7c00d0214301150dcb23d6daaef35a49f97f. 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/QZES91988225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa479bbff920056f70412d54849dc48a13e4a0a16ffae2da50c1dee841bd53770. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZES91988226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef0bfbef705368d223216231516d1670a935dcdd99b72fb59c4ed291548a432c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZES91988227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a9eaf3c35f57d049e9456eab76f857123825552259d06d05e8b4342a625383. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/QZFYX1907475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5a01b018253832cf0c448eb70500a2d80cfe63d18fe13d6c9b5a8e10136115. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZFYX1907478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00805efa9a823b0c6a9a6f43db93544b60fd004d0586d02cbba0347e26a00314. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ATDH02200207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51502cd29273b8274bb11b904b1732e6acd7739b80374ebdb6936527bf94e0c5. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ATDH02200208.