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 0x9ff554668f8838139570f73a6efc5bdbdaa396ab5ca3f2435ba52d005331c973. 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/27dd62a8-dd89-4107-b3d2-ca7bc6a9240f.json and https://artists.proofprofile.net/proofs/artist/27dd62a8-dd89-4107-b3d2-ca7bc6a9240f.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 0xf2dcfb8ef4ac9456f8e972111c73f698a83068dc1c41c2da05c581bd0db60412. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/GBKQU1924097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c3587a316032ee454640120d206946036c93eacca317f303963b6af8c0da74. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GBKQU1981901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ed4f22d80b8a9e122d075e9add0ef90264a0efc735d288c62bc54b959cdee1. 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/NLQ8D1900557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c1100ef5d6a20d05965ea1a11ff82db9042f69417249eff40565061e366501. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:26:53Z), 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/NLQ8D1900634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f16ae9022afcd28e5113657f6701baa891909e79d3511496445e38b8d738aba. 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/QM4TX2220537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836d4bdac48749243e735f8b77257a96f3644a4f12d1d066f9b4a16a70cc5fb0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM6MZ2252973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eb9b88bb4ca9d6327b3bfe4a41356f9ece1b44dc147e0800610af84a72a87a. 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/QM6MZ2272672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee77c42f4f37d1f87a8c7b407841f42554ed203e41c11bf79e6320997fb1b41c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QM6N22288212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc94dedd67aebc6655f90fbb881cea83e18966ea06e1102990705b2c263630a0e. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QM6N22297963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda039290327342e2208ea3651bd6bc57b483e924d6e580bceafa4e8b659a9c15. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:19:23Z), 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/QMDA62214227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2816223a7da52dee502ec163d5b52c06e9d4ab3afe84f570dfc5c3e5340f3369. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLT2H2200831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc572e649b4ed49c2097cdd65cb89f7613485e0a401efb2dbafc4ca1071ac221. 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/NLT2H2200904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f264837f88e655400ff03de44bf54f6dd398ad879e0813bb09ff69ec694ed9d. 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/QMDA72296510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c62ebf276425fea8fa14d62cac313362fd681b072b80c75930dd858f7ec16ee. 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/NLT2H2201012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70bc6730595384b3c017b2365655fdc8b48ae52f6592c50aead15cd0ff5bd12. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/NLT2H2300427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09848157a1a5b770ead87242ce87cbde030bab9e15a5b0e811cec7e0c407e8a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2300548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9dad2ea63367cff4c1d8c99676002888f4c13430d8030aebc1eddaa0a5d541. 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/NL8NY2300065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bc3ec1839b7768ffcaa925fe396393103719d1821558118af91db3d7c44fcb. 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/NLT2H2300654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13582da4129d887a6f28bd295dc7ca676bcd9a02ac97bf131e9d29f56f3e4e2e. 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/NLT2H2400491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x291a706a7b7e8bfba11fea2ed5a3b49d086411324ea2511cfb7bef18b5ca3501. 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/QZFZ62305834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72778b9b6dec850c0a0ca0560377aa49f871048821cb224509ef534fb5b824fe. 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/QZRP52260042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc0c564682ae16560c20794ebc9ff42ed49edab13b2b5e8589ba72a26d4e2a0. 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/QMFMF2117130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e6b73bbd060b8f4416c53aea7de1202a241b745c220d599019e9ec0624d414. 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/QMBZ92264610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d7d62dcf0799c8417893cf3b26cdada3060dabe281d3fae87867ce20c05feb. 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/QM6N22279867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c94142657543de103a8aa6cbb17ddf677c91e955c07804e3e370caa72f22c2. 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/QM6MZ2276139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b84d0c7061edefcd782a40f7491d11369ee20615fe8ad90b04a8f6fc5039fc0. 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/QM6MZ2220509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50d408fb770110f1f066a045b367de5248f08b0d5a27a11e79a59a745176452. 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/NLQ8D2102255.