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 0xea26bca2d460e3aa48ed9c6665ae84e496b83ff620ad1e02b5feb52fad625d59. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4178f67-0514-4732-8c05-7ef1f43bdbe6.json and https://artists.proofprofile.net/proofs/artist/c4178f67-0514-4732-8c05-7ef1f43bdbe6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Lavandera (Última Composición de Violeta Parra)
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 0xae8b298d4fef0c3f1841da509105935bd2395d4d6dc7bdf3eb83bf9800ee1b56. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/AR4HD2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad986502a21f80b821dd3a0d616434b44adfec707dadf1aff0ff862ac06193d. 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/AR4HD2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf0e6c1912620d42d3456158f82cdbeba6a2af2d4060d366662d65ae52ee32e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/AR4HD2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f10ace33cdeabd97f2421cde2b9c36944b6d67d85553586bc9672474f757a5d. 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/AR4HD2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c5abb4d36e67752b0ee6ab356487c0db576d0726c716191caca73912f3e8e9. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/AR4HD2300001.
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 0x1ea39f875b9450ac002d49077955171a7b2fcee8c7332e5d21f6d7f0ab1ca8df. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/AR4HD2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6417f58fbafb055c1186a4b13a03f2adfe965c7ffd0405489c4d7525c395e8b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/AR4HD2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9feb9f2be6eaa0e10acdaf578efe70a0e8d572787b4e203209ef0ea4c71ede. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/AR4HD2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d4fd4b56d58015eae5444e872e7cca0cb8c3e3592fd961e61b0246fe3bf2a3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/AR4HD2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3eb95903d5f0a8ba8afb4f44147518ca04ea6280d5300baceb9e6edb2c9e85b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/AR4HD2300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4f69e86d403668c98750a48000c3ff16cfe7280775054f0b6c87f4ae3535c4. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/AR4HD2300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2bd51c33dd1cc5257ab54349cf79ef2102822f8fac4d30cb7a9ac0b6de9d65. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/AR4HD2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd1cf31083ad3fe569ccc355c5986f65b037d9d2b5d3c4c2d13b16e8ede10a0. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/FR96X1894352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd937e73529aaa6c205cfb2f72657516b49e71e30bad37fb47c10cd3ff1866d1e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ARCH22400033.