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 0x18a33598580a22a235be10721b2c5fe9c4168cf5c3f86e4d118e46f634a8120e. 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/fd0b8409-07f9-4a02-b782-8c29f7170b60.json and https://artists.proofprofile.net/proofs/artist/fd0b8409-07f9-4a02-b782-8c29f7170b60.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 0x7a59606c9026751f45eec714121e8ba1edb78e1c6597f3996b3dc5a1d1770d32. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZBRF1822472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c80ab35ffb3d20fa3fba6f0c10b0619c4be02826a1e623f6350d400591a601. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZBRF1822474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39897a7d8d088e7c7305bcb49bf1f58eaa8f2a943f7b1f00dad84cdbbd3f274b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZBRF1822475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x582e14286d77fdfcfb10f3094e1157d17f725dd505678132e5c66dc042ac4a09. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZBRF1822477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e877c9d7ec1b3fd2ce8bbd83e9cc18bdac604b75684f07c5c9371a6763fa3d6. 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/QZFZ32241758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8caac9d583935b2a3b0c81f23e2803e53739dfff4aac903f3f6aaa8da0f7549. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZFZ62283919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7b66213fb131cb927c67a4474d1d88ade9e57ff0fae8cbb2b28cf360a10586. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNB2230443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d94e975c796ed48d2a14a906829c5c6455ebda671fe107b160ef6cced7776d5. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZHNB2259648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x847af09a34633c14bb07cec8c4cc30368e2e1babd6a7082458815c1c78832d51. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZHNB2258494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49ddf147f075af4ff01c3723b8d04bb0c91d993848567cc71e1dc32cdf70842. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHNB2259646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf52cfba2d45dd1d68c511c4fb02f55d7515c37938517107fac013b808da0ea. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QZHNB2259647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdac519e49c3893a01c6f5e9af1f6edc21fe5908f37010daed0eb85a8d9b5b9. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHNB2259645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c6644f5a948690ef2e754c5427ab9702b73684aee9b1decef7fd8ed02e297b. 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/QZNWS2319021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2290d51e3c6de72c530c9bc0c3b3221e8ad13a2448a24680432805f6d74443ae. 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/USHM92275264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67191c1f7befbd27952645ceaa12a0cbc74bf026a7ea966a6edd6069f5613713. 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/USHM22041707.