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 0xa006b92666f37ec181741c32a8b4dbd09c564ad8731734efa162a8bcd376a1a8. 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/b5452a75-175f-429a-9f6f-a6e776f62828.json and https://artists.proofprofile.net/proofs/artist/b5452a75-175f-429a-9f6f-a6e776f62828.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 0x0d333907f2e97e3fa4cda066063cffae13ca0eaae4cfa8eb3fa159587600d648. 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/RSA221900370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2552dfbdb1d154751071b8c5b92462f3799118ce01dd118fcb91635180298bf3. Chain 2 (Bitcoin): anchored in block 958731 (2026-07-19T12:35:36Z), 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/RSA3U2100336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6adee5113e4c8387e126a4b1eea119c35b4bf8e62494e2fda21cccec42a546. 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/RSA222010499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7b607f3564640615e072e4d485f4919dba625489c45c6359dc58a6d47d4b8f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA62231719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4adccdb1692aec66f0029a0c9614dda4691aacc0e357a11d292cd9bdfe026d12. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZNWS2403959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069b3dc4596f9d1d17dd3ac45cf3b489f5f328475b899a65c24f283e1f74c952. 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/FR2X42578654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985fb0df5b6e11c470ad1d44d299a99a4d3e2a88df663d212af7c8318ed87228. 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/FR2X42578447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe58a9fd1aece7456199b54806bad6f431aa00dd33e84e6aca09ff2dbda0347. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/FR2X42582837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985fb0df5b6e11c470ad1d44d299a99a4d3e2a88df663d212af7c8318ed87228. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/FR2X42578447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069b3dc4596f9d1d17dd3ac45cf3b489f5f328475b899a65c24f283e1f74c952. 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/FR2X42578654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe58a9fd1aece7456199b54806bad6f431aa00dd33e84e6aca09ff2dbda0347. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR2X42582837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefb0de0341da95ebf56402886dd4a5a8349af2005b5c73cfb40b7b78943a35a. 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/FR2X42588141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a706d69e5f7d6cdf7f11a37a1d268b14a4b4656fc7b16e5688fefc0284fae4d. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/FR2X42588143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cfb4edd060f91193de59357bc1cdb47ba9d08c5db5dd4a7468c93450c7afcf. 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/FR2X42588144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef72f77b828890bf706499851fb7c97f4805bcea8d746db22c38cd98abe3833. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/RSA131701306.