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 0x102b8baac122f9efe14dfe80b81182a9d2877a66cbc5c3e85298d4c2455ac929. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/83a7cb97-b049-4e2b-bf79-ce96e8eca3cf.json and https://artists.proofprofile.net/proofs/artist/83a7cb97-b049-4e2b-bf79-ce96e8eca3cf.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 0xcd672ce1a67f92b87765724f79dd634f8480ee71ed5804153fa1e02880986a91. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/CH6542233044.
Cántaro de Música Romances y Canciones del 1500
Agustín Barrios Mangoré: Valse, Op. 8, Nº 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa873f8e7b9d7e59b9f0e0da28f6ea4b91bfa9248b1ce8b53aef7342952cde7d8. 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/CH6542208629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096bc0de01b37d0036e683f98c3fed5f2c7fed560c9465d86e8fd25d1fecbca0. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH6542332619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb713e27578ac0e8fad2e1949652e000e8a60ff41d1c20c2dd1037008b8e6a615. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH6542311248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488db14cc0cc76abae67a9f7a9c768763c4319691a46adae8181423e235084c7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/CH6542204095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca866d853d8fbaa2bbdcf59bc11a2f1e8042178e532330579a7cee2521c46660. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CH6541676357.
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 0x81bb26b5fa77086b31b3fe3a4b823a434849bf6de524f92ffcf70b5ef3523d22. 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/CH6542266262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e5ae0492d6536d53318032dccd0bcde96a7b09eb97f72898c3cd3996130e25. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH6542161184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a52b2d61288634160fd5667fd4a14a47f20a09a883b946415f4d92b45e833f7. 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/CH6542321744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a2315ffb675c8b717ddd9e2eceefd3810b1f235f838400ec505fe9daf08a72. Chain 2 (Bitcoin): anchored in block 960305 (2026-07-30T20:14:59Z), 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/CH6542268662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af3b3c74309df28f6bf55dcdfcf2ca43b170e8971539d632f02330cda8403c8. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/CH6541680726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c05c47360ddf935972fb60c020037cf5c0e55742186e9c67256b30474a6b10. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CH6542159284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec054a21c50472e0af4fc7e26cbda581a5f20379ad4beac3c80af7e460e2b4d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CH6542333844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69fe5e72b95f16573cfb9663e5f6e2ca4e6a2fbf0641aa20d47abd172214a9b0. 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/CH6542420602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107ec85ce87be84909692996b7718027cec2f9e562925e833e83f8633a2b63c7. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CH6542190018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fcc962361a2e663336df137b9c5b150016ca47f1c40e6160e5755c04b408b0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CH6542348959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0ca77bed9e527dba58c3d2f3d110da607253fd75146c684fcce5f53782cf81. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/CH6542325734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dedbb9b5ef996629fdd765ad43ffc058e46261b81872b6a1d8064b84cf6421. 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/CH6542141657.