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 0xf34c35757df1c9d91aee29042b7e03b40a0a25c4bef15ee31c6d61dc99454805. 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/6737af97-00bf-4d7b-9a64-f1b49d12e87d.json and https://artists.proofprofile.net/proofs/artist/6737af97-00bf-4d7b-9a64-f1b49d12e87d.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 0xd5a446637de02bbfd057b1e19f6494a9e583136d828c9e14a2b3aa70f4bcd47e. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZPJ32133230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e08c84e037da6078676d84adb06416655828021f5d49d8a8f044e76d1f3cdc. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6M2227182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ff8154533cacae318c172be4f5905f801e486a98a2ae3b8ef3cc7a54eb2d09. 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/QZNWW2290894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dbe476f51d945868a918fc39ead22eecda78a514776ed20cb9e0a4bf7a0ed2c. 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/QZNWW2290895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e7344ebfe9c84fca0e0e658dc62575d731db0219036b3b7d29972ae0ce4dc8. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZNWW2290896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bc85a732186519eed45a4501f57a97047d8cc9bad55c6cbdc2455949fff774. 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/QZNWW2290897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1023a79dcc11cba6e2f673f7c847a6e4cca5090e275fe757eec0b380654d4c84. 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/QZNWW2290898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524e7377518c4a8005d49f1363408947e20b7f3caf9439dc2f12a3a96373978c. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZNWW2290899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241b3be9f578973e22a707a0dd5eaf90d35143cd0a536863eadbcc7099ae3e61. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZNWW2290900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4d60a988b6f837c769f08869af32169dae9914144c91ff2de4e29d41843398. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAU2200212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee03c77b47e286276684789fbd838ee81eb958ee7fa95acb8bd83992fd56144c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZK6K2396621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ad6b589c047d394e0cfe032cbdef6a87c5992770efa2dfcf64a1c3f501d5bf. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNWS2319144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb2c1213538086bbd21527c2809f813fb1667e4b470eef86edc6b7f2436a303. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZTB72385431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x733de8fb31d3ea6ee25420436eda95340078272b8ce65e8fe0e28c23bb9bd8da. 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/QZNWQ2415703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3341c6575191c4da840499bcbb76405eb1f307349da1011c883bd9e890192c1f. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNWQ2415706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14e4cde5bc1d3c63b173a1857d7a53c80de9b7135b8104bbfc5a995fa6289ce1. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZWFL2422943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3050730faf7e4011225b0d62ecd3b08dd25904c7f5cf59270a3f9a769f735b55. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZES62556373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aad09fbc71cd4a5d56296ffe778a80433f405200cc0dd3a26ea6c3197256a59. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZES62556376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89593e05f9aadd73c80ff621c1e48d3f22f31b0288f8cc5af76d90645bec41e9. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZES62556379.