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 0xa6af5839f323182596bdeed65ecc8e72312aaf847db15a548cf1bbcf51ef383e. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c9a2e61-2681-42bf-b129-c032fe58f2ef.json and https://artists.proofprofile.net/proofs/artist/9c9a2e61-2681-42bf-b129-c032fe58f2ef.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 0x13a1c5db9f306d2ebb0841d6528c6c0c01b49483d9237dd7f59ac8567a725043. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BRTRB2307101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c10dbf3875f6d019b8bc4c9c0668c11376137ab83c3a669dd8147f458ac72a1. 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/BXHPG1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b26861074ea2b068f5988cc1398bd93aa2ce562df673dbb773f6f353c591ba. 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/BXHPG1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07da86aa55fe90a95cac8c0aca104e7fe243fdf9198f013a0ad1752ec52fc73e. 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/BXHPG1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151e8ff0f9fb36101bff8245714a12bf7736a90c165348e321902cac4f15407e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/BXHPG1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7ee7d3d07ee5cbbb611a59a7fb2af31c6cf9f7411aaed78c28b972a49e270d. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/BXHPG1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe314c41bc91952188885ebbf715a4538c6260c433c36e08abe60d14eef2b77b. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/BXHPG1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07b7ddfa99b9c8a4765cf7ef0fdbb1220c79dec4a9d0af4d8997ed82a1207db. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/BXHPG1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c9450f25bbda9e123a3e6bc4b4a5c4b9dcf7f763bbc6c3a48f822e4f759cb1. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXHPG1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x061ae8a06348f4ca99ed846455291057795fdf1fdc171316567893ff519c99b3. 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/BXHPG1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd50a58e5d1fb4e49166899b5013dc326a3f06fcd98cea08c46c4a45e7922ebaa. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BXHPG1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389e4984afd47d540eb53b4dd9b0a9be9f192170dda3c2082383b9b1ef0a3fb5. 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/BXHPG1800002.