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 0x106a01d4281a58cc5c7d578597007a4227836adbd53d63a11bae9712efb6256c. 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/ac0a6fdc-0187-4e7a-952c-ad9b4763b33d.json and https://artists.proofprofile.net/proofs/artist/ac0a6fdc-0187-4e7a-952c-ad9b4763b33d.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 0x3180a95044340aa6d6bacd12cb7d46cef65332a51e8640d2a3cf928623686183. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/HKG731875272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3180a95044340aa6d6bacd12cb7d46cef65332a51e8640d2a3cf928623686183. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/HKG731875272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1c2076e2fd8bbafe42611de935b195f5ef22aa8282b7cb8bed5d90b8bd2762. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/HKD012272368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1921a1a3c0fa3d0f21f5aa5bd25beca1bc8e42b7d2d754da715c875dca9fce8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR96X2416291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68d72ea0d432276bffa6c0406ca0a3b9808e99ea5e5b52b46deb15988060f89. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CNZ842200705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86affeab6ff6fb4552fbe3328d155e179be33953c04e704d94e03b50e9720118. 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/FR59R2469664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a29d01ecd628e9f2cc262490347a1b140ea869f996b71c56affab73b30b45a. 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/FR59R2469665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7866f26b57741a2fade107983365588e07908ef9a3b8f6f1e6ba274f691479ca. 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/FR59R2469701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b96442a9536c373524a10628a5c48f7cb4caa889b909b89460883733fe81f5. 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/FR59R2469827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fc56a6101df0163287b16a28a70de782b9c5c8586d490d146c45d3d129e8ad. 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/FR96X2415237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22bb42f06b3f6249405ef532f2e39db89321b01dba3e9eb8a1aef426e6f9285d. 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/FR96X2415241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33957da6500f1682388109ea27c0cd7f7c452d7e100f1e92cebf74d4b9dc69db. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FR59R2469653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02bf4fa905486844bc456ba3495d82f5610c2f67beb7efda410799e52d18c75d. 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/TWDL72304452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00bd89e8db65f429735fca98e44362514965dc7dc2c350219f24c40bd85724fa. 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/QZJPM2481055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1fc8d6c55f89092e8b9098f18afb0f8aaac8fe786e591d0f166fb51d2a865a. 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/TWJ511900018.