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 0x2c6c3c55273d6ef103d120068a6e8070a8510880ab4f0eefb147c46636798fdc. 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/da609e57-73c2-467b-9e61-4d80a132445e.json and https://artists.proofprofile.net/proofs/artist/da609e57-73c2-467b-9e61-4d80a132445e.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 0xd6d7faaeffa3b6a76f25519f06abcfe0f48836a18d9cb7b0773b788a5ef9f1a3. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZPLS2426669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed45c56bd38ea128845d80dc7a3cbf1f3c625d655979636d3e7e110f2709c0a9. Chain 2 (Bitcoin): anchored in block 957867 (2026-07-13T14:55:20Z), 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/QZWFJ2434274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60bbaec357cb8ea0c83f6fbe10c3e9fa2447ea6e93e925ac032de2ec643da3c. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFJ2434275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28302ee7a9246ab4061cf632a24d1a2e11ccfc1477086a1016868fa46534c4f5. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZHN72511011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae0e30e8b43dfe672a904d7f4d2d15a7f43e69d1222b7974318200b9a4c9d905. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/QZHN72511012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4713701ff77d732610373e6eb50ffcb854236fb0f82d6beaa660c791da21ca2. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/QZHN72511014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472b967b9a17281401a2038e44251afdcef410c1348e7278f316819f000aa8ff. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZHN72511015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ff03ecf076b5b8771da887fd04cb012d54de15cbe6bf8b1331ef36120d8103. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWZ2557559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5d6a954dced5b0867c261f39f0d633392c499fa0705934c7abf3c9f693b3931. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFK2545391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adb04e253aeddd85b5ddb2ef490d1e0740a01061eeb44b98fa2ad6ec1815496. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFU2539889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeabdcc923e9da6318bd883439ea898a93c457f9a2a1739da79bab16e4f17c6a. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFU2539891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e11c983355c088534e93b17f16188573c5e0e2638aeefe8b2384333da17940. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZWFU2539893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f182e6adfa79c43cd110cad86db048109a6e6fa1451a9e8cb65a36b68f291c8. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZWFW2550008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1921bf67be401a44d5a99db840dad9afe405298c3ff986d68f2b69a52ff1d293. 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/QZW9K2421358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3bca926cfad20c2782b4e5158d99e77d2219fb4d6811442cef103d0584625b4. 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/BX4IU2501285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cc25d0b32414ac90e1e064601c763ed081c0a4450308754aa81e71f75c67ff. 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/BKNU22500065.