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 0xceaea95754847a66aeb3b592d27cff434e78866dd609eee5fa1c1e824becb30d. 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/6ce75350-1c61-4ae9-9ed2-02baaa737cbb.json and https://artists.proofprofile.net/proofs/artist/6ce75350-1c61-4ae9-9ed2-02baaa737cbb.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 0xa0b7bd7c94f647c40c942c2be47fae98bb0469965c9e0236c82cf0aa1f20001f. 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/DEA622300948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba342f9025481a3f59e1a09de67bc620a5fe84aaf41e9c7ea129dc3bff1090b. 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/QM9WM2300169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982af0846c1821299b6cbfb3eb9b44090a60c57a2ecad8512936c03f246dbb0b. 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/CH7812411944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5ca6a5c24019c4039be653993675bacf22e2e4a78b73f9cb87bf44d4c075bf. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAHZ2481997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbcf0622864b99b5b78ab7e2d11d1a1c29ed6aebdaaef809cbfa3f4e51c83a1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/IT0J22100542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e7a60abe9d2ec17661e26e7fdb7799f5af316affcbbca2854f17746c1f0198e. 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/IT0J22100543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93b77fd7820e0136a6a0f9a6f3778c9964553bbf5310780ef2cab01490493028. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBK6Y2251923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f0cfb7fad3ca6ef0d70231aae8e05a816a25dba24f590a936dfd3e39438827. 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/QM7282359165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8e05a1c3cbb5edf1b3742137762ffb68fd8e872dc677eba19bc1a45467cec9. 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/QM9WM2300172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195f204779ddda100ed320f6d5003d738f379ee6cbfd4eff8ad38a0a62e24016. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBK6Y2251921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244ee681130d1058c8c857f754d1c55e330bf3da5168cc7dee979e49137f6502. 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/USNRS2443860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a6428c6b525a81592a9eebfaa59e4d1e80080395656cc8582df7d40f9e369c. 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/GXBNP2502029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ff269d6e1db3854b3cd1185266b37e11b3703894e01087941497ef8368044d. 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/GXBNP2502030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18156b9a06b5a1e503680e963ec142e14fa903e2a18594c9573712237aa3e401. 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/GXBNP2502031.