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 0xce940fb4d14bb62c738b4b8550760340fed1eddec237f0129d854bd269154d2a. 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/8487f562-76a0-43dc-93ee-03bba8fd0e13.json and https://artists.proofprofile.net/proofs/artist/8487f562-76a0-43dc-93ee-03bba8fd0e13.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 0x22d40a56bdb9df2f0e69263e9bf465709fdb80a0d1ca389741003f8e10a8b18d. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/DEBZ70400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bacf7ec0157f729f98e775f3181bf5208ba321c6041d894ce35b9f23730648c. 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/DEBZ70400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7022c66f94cb8416b03040016798f87d06738f047e42e819316c843558218a14. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/DEBZ70400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0357f2b2bd0e064aa335226d897ee73576c2887484cfb145d499413411869f. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/DEBZ70800231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf09aa2c57237657c4e249bb5ba6a4f0c351f999cdc94d26be518720717a2d6b9. Chain 2 (Bitcoin): anchored in block 957603 (2026-07-11T20:26:17Z), 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/DEBZ70800220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c612e3a75e7c7585528e005d62ac4c41c2d86abf91d3724c5f7e6a80b56519f. 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/DEBZ70800224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68016802c013880327bae80b89850b497f7d1810c02b4a8a2d3ca34327ff360d. 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/DEBZ70800226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9f01a9ec7702d2f4140b4d7a0a56489a57e540d1212224967237e7f58f6491. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/DEBZ70800225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d75bcecff7e0e0412f189b7ccefaa8048c7caca87b2338f9baaf0dfcb7570f. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/DEBZ71101097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae86292cafbba5114bd79da9fe88e10ed0eac931bd6cc74a2a2ed19c6e95907. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:26:58Z), 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/DEBZ71101098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c17499f6ed07c1ac1c2b65b1ec8d3dd194f34667a814b80c09b8de809c86805. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-22T00:21:06Z), 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/DEBZ71101100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd08d7a9a0bde59c3c01b40c0336d93de1f1743f6db1dbe87d31032261ce12e9. 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/DEBZ71700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a384920e2855d52336efecd0ee1352892249ec1525ec804ac6bf23829226a53. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/DEBZ71700109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92fa78f00216e646fdc204e0d25d988b1a494fce7c5e4cba39caa22be3b37d1. Chain 2 (Bitcoin): anchored in block 957599 (2026-07-11T19:42:17Z), 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/DEBZ71700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd08d1d62cf8ea3dd262c50ad51f5c742da81dcede051c24b615a597a03b9978. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:02:35Z), 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/DEBZ71700115.