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 0x40763f4132467c2a4b773d2c4a0249f1d09089cd0d698cd615991a4f71ceae30. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55fe4be9-9e57-40a4-a77d-17f56d409300.json and https://artists.proofprofile.net/proofs/artist/55fe4be9-9e57-40a4-a77d-17f56d409300.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 0x602ecff1eb0fcb3abc9696e1b2ab6860b0538dcb9f4b63f94ac4cc00d5fd24c4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QMBZ92420141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090b219314065c47d2eb3f289b762b1146cf825ba97f8657ce4b536230e8db29. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QM6P42476699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111c774805f43a3eb6ffa3e914d0a213737ca102fea14532003fcafc6ac3f918. 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/QMDA62460190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2083e867d0432015a2ff31144b2cbc41bced8a6f6ef806923a42fa78773b839. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QM4TW2353808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1097ebe53fbd2d8800388bd4b81218a711f0ab87457bf200a507e3a3f21a92be. 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/QM6P42309418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2408090a849f596bb91ed72a32a75c9102b885d7467b4c8d40caf94b0dbe72f4. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMDA72370254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6685b7973c74dc95dd963d61828c2410c92d799645a8f5859855db5e309a27. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QMDA62443075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48c3cb4b1cc46f14c54731fd31f3994d9bddc1231097bd43697dd4895404ebe. 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/DEZC62000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6284213913120c1902f8433f22f6a63aefeb7f025bd5b04db9280682504021fe. 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/DELJ82070936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72018db12af618fdd6cad99a4c9421443dee7d957a5a8d7a565bce6b774b8f1e. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEZC62000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e69556369a680b7536578b3146a4b52a790eb4f9f6324316fafa40f3a8a00c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/DELJ82069331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6685b7973c74dc95dd963d61828c2410c92d799645a8f5859855db5e309a27. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QMDA62443075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602ecff1eb0fcb3abc9696e1b2ab6860b0538dcb9f4b63f94ac4cc00d5fd24c4. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QMBZ92420141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090b219314065c47d2eb3f289b762b1146cf825ba97f8657ce4b536230e8db29. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QM6P42476699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2408090a849f596bb91ed72a32a75c9102b885d7467b4c8d40caf94b0dbe72f4. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/QMDA72370254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2083e867d0432015a2ff31144b2cbc41bced8a6f6ef806923a42fa78773b839. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM4TW2353808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda99c6ec044fdc3205ac91e5425dbb42725972b5b84d47b7187ecc705872ebc. 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/DEZC62254716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6560d91d2d62fb90e69087804058cf7cfb4acfe0219cd91489f6d8419001d3. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/DEZC62254714.