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 0x5ddf304f8a5f469297b48f2b42381ca17950ca7cf1ce9a46e6ca16d40337c4ad. 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/c73bcc1a-8cae-48ac-bc59-2ff994492cab.json and https://artists.proofprofile.net/proofs/artist/c73bcc1a-8cae-48ac-bc59-2ff994492cab.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 0xa47a6eae89ba6f809c63be0fae775c3a6e5653c68649aa6d5a069078904f3af3. 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/PLI367734130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ca152d2f564d7f541b652f50694df154b356a88e7f6fb1f57e72046b5937f5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLI367734120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6a0838d8cc1e18a61c55a03095155452e45a277834cff84c745ca3efde28c6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLV402000824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd0171bdd504b7b64840717afc5d6bdad0a965f53ab1e9f76ad6ed8b3714df6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLI367714620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59dc9be1b911dfe6b623e62a1f53a865571ef832e067f2ece0002bc637bedcc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/PLI361258420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5a7d3a196df14f929b21a51477443bad3a68c323b11ddb9b55a8751dec9711. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PLI367734150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf0f504676e6df7bb97af4ea95a7da5f0e4b96bd9e1481eb0fb11ccd0917175. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI364797030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42358d57183067acac0bdb3f2ae7b9c8236e484ecba98575fcd2a12f52dc5f9b. 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/PLI367734080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9073e2d4541a9d274e8d4ad5e4578197b4b908d9a472e40744f72cf64953dd. 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/PLI367734100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685d83a11848b932421abbfb2ec52fc7079e34e94cd1e3991b006f33c04de468. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI364392220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24e09371c5e83361c39fc32d5e34a898204c528e8bd1f033b613b449a910931. 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/PLV402000828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8e68aef2cc4f78755fb68c070e6bf796d1cbf1fa43f158407723da5c1e9afa. 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/PLV402000829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b09bde22693dfb68cc61f3131add4dafaedd587a3400a369f4ccdd999e3056. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLI367734110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ebd50beef6d4bb5e83135529c66834caf11d3a46c8e2037f7f4dbcf139ca46. 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/PLV402000827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc167dac13707f9a46587778b2b231910f70383cc8aa6fbb29a96fec22781b9bf. 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/PLF242107898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d3f1a9bbd8d5ff5e03c408848fa181236f54d39191a68e24959c189c5058e2. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/PLF242006937.