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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d45a2acb3086dfe27b09833c451945959f0deb50d0388e770a68985c1938838. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ce05a67-1cd3-4e3f-a629-132b9498dfbe.json and https://artists.proofprofile.net/proofs/artist/8ce05a67-1cd3-4e3f-a629-132b9498dfbe.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7ecae98e4169eb07041c2dab91fecb849e766a548b2f9b86cee5177a65f35c. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T21:29:01Z), 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/SEYOK1841662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332114387f6b281261cd0273a8f689dbceeda339373764344283f9febc9784ab. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/SEYOK1834919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda403fbc8a5aa3d8443d107f96ebcc651991676e1390dfb33bbc927c70056595. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T00:01:53Z), 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/TCADY1804427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea873a29a2d318dc2b8a631e490504f60bdf75aeb568e4d1ca1d6e6629628e0f. 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/TCADY1879731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca6f90ddeeeba202ec526c77e813fb3fa2c6ab5d6a42403c7d1d7aac6e0d1c9e. 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/TCAEF1909374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa79d5431f32a6501afb0fd3eff3ee4854e64b02f636419bef34f6fcabac64aa. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/CA5KR1956011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6026c15cd6fbc17c4bb3421933ef7ddbb196dff662d351130d275ce362ffb0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAEI1934548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f826907fd13bfd428bf1712e13896a578e127b7cb690b7d6c5061f2d7048882. 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/SEYOK2102349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062376db3e7806be9e7d60763d15022b7aa9397ad96d63884b033d988465aebb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM24S1822386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062376db3e7806be9e7d60763d15022b7aa9397ad96d63884b033d988465aebb. 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/QM24S1822386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700674267ba25e35a411904691932a14b2d171f6de72d1fdcd78d629434655d3. 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/QZES71804339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e93951eec77d17d92c2f6c4cafce5ac5cc128149dcb4fdbaf6c4f9d329bd7b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:47:20Z), 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/QM24S1833937.
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