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 0xe8749a9d0df2a4837dfc6fcda708e50a740f16fb29853bf37ade5a99d48dd474. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f51d8722-f02d-4f0a-bd1d-806751d953b4.json and https://artists.proofprofile.net/proofs/artist/f51d8722-f02d-4f0a-bd1d-806751d953b4.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 0xa2c697f032ac30dfe8e292a68a80a1d4c3c7663c7527f9c7e7a887cfc7def91f. 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/QZK6F2398514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612a001442d122ee1988a77dc19645124f7a213465f09557d48b58a1f7996ccf. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZRP52301894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa900e5796f07b70979d4e8d0a188ed20c73f341ea0878c6e34986985473ee65a. 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/QZRP52301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d72250e2c51cec96a6b50fd2816bb104823988e8376b8ebe2523b455755df1. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZFYX2458827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68d24c3c1b9cd12d98c615cada522aafa9cb4a0bc256f190c2ef3b2f4a96128a. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZFZ32417226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3547842ddac5508196e4681daeae90edcfea20928c1d2d0cff0baac8a2ff16. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7N2445862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7068bdd74138af980e5144cc26ecf7d7263ab4247764fbac48f49d81b5dfb3ca. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QT3EY2409587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd24b2f1269ecd77d5dcedc8881ac06419449f264fabffa96406cdf794d6b02bf. 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/QT3EZ2425435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3547842ddac5508196e4681daeae90edcfea20928c1d2d0cff0baac8a2ff16. 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/QZZ7N2445862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe732ad16cde6986c9c33883c9135cc2ba0ef082d6d564879fb2b08b11c4fe9. 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/QZDA72553588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b2c2fb6470570a0c94279f2fe4dba9fad5836dcc8c1f340039613adfe7a208. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZHN42546398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f3c6f7a6d9dcbdcca0c3d089708d60a7caf095736c22800e2ee09b45a1b584c. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZHN92537175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9e6048a4e17b4774adf7e88e248ee1b99738c606538bf1f6cc134d53ceedf3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZK6F2522316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9ba9f62967a2e2d445ec2bc417a39e33ad226053a7e68c80f97e0c96e0792a. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZRP52507719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe5b0ca478dd1b457c327b4a5935f8940120daef3cf3a7cac586066ccfc9d87. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZPLR2594317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe5b0ca478dd1b457c327b4a5935f8940120daef3cf3a7cac586066ccfc9d87. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZPLR2594317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67739e66fd6a8d99b71155f31b7c8d8cc5580a73f3a736f014298eda9b72f464. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTBF2501091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2385a11ed83481492ee2b2f2a2a83a2d11274f0d1b6a416c3c5abb5ef955a5. 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/QZWFV2597212.