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 0x27542d14ef673b8c87db41494a0d1d82db2947c680cbefef0a7c4a13e52e707d. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db60c2e7-91fc-40ef-844e-da5a33557f9a.json and https://artists.proofprofile.net/proofs/artist/db60c2e7-91fc-40ef-844e-da5a33557f9a.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 0xa2218608131ff52108fbb96c4e6cea0b2455cc8bc901f29214cfb7f288647f25. 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/BXBFS1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ade975cf68093f9ec40bfa9f541ff3a8d46b92fcbb5d4f19d5a79ae49fae15. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXBFS1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34af868ed5f03980f8481bd03863126d30c1989c9420720ec97074bb955656f. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/BXBFS1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23e9143c2f1786adb06360c7bc430d2bdba39e666c28ce3bf27822b9be6b344. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BXBFS1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f90e1effbf8517dae5fa5fe4cc6e05fa5856c7151334313cd65be1a8e91a1d7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BXBFS1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c19dffb69e76ae78834f29998e1456b6ada1d39e1b61fa7ae567899add6ab6. 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/BXBFS1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50bfe8a814b5f6b1dd1f9ec3c9f63dbd5f614f1e87ba55bb1cfc088e39e7b45. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/BXBFS1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c36bdb357fc8fbb83a1b3a7db863e013faa464e7d98364638cd23e41faa28f. 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/BXBFS1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e36d06129f338d6fa90fabdb6e891c9a15b8a2bd0ef3014a04ae3536afcdb5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BXBFS1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa335147bb22ba94f193552d5797966604e12ff835ac11fe9d39168ccd8a0f219. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BXTVE1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270b2923ed10bde246eed54f613d46b00939c6554152bd76c7ade98033a747c0. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BXBFS2000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc26c2418456d24f1b7920f1c37bebfd09d4ce5afb72571bd346f9dee880761. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BXBFS2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98268efc7518952c6ecaf05b5fa8a58b3c7e4ff6e8adfb2ff356d97cdbf224d3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXBFS2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8698f9a69b4c2812c8df28bd0c637eed71562c7ef31beb4fc556b7678003f610. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXBFS2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8207d8522098665003146c7ebfa30df2d206165f504a0cfeb157af913534a69. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXBFS2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a188416f43598f610021b385c54954de910f19b45b407d48aa441ffcd8a7bed. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BXBFS2000005.