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 0x407f6fb70ace720bb3c70b24177bb84db0563271d01e399d383445230cd58e1c. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1da3f089-6429-4b4e-a9b5-296da0246f42.json and https://artists.proofprofile.net/proofs/artist/1da3f089-6429-4b4e-a9b5-296da0246f42.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 0x8b1df0f6324ece3e1659c1faa5e7134a9cb22f55536299248605ed4c5303ba2e. 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/BXVMN2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9098e139472b92051a5ce41becbd78706f5d72e2da16848ece5e89ffcda8db48. 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/BXVMN2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9ed81612ff3d461c545dc6239257e8d9acdc55e71b9e919e03e1b6c3e23aa0. 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/BXVMN2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274a675793a3a564c49ad3af9218d761d9d9458f1c375fd1e45e8384ac4c64c4. 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/BXVMN2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9549737371b3439ee87b2bf479fff5ecae763d6183d110c653a29e206fcc95b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BXVMN2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29fe5eca12a09cd1462b1e1f3b32100c62bb2fea67bbd9dfb429e72f5facfaf. 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/BXVMN2300042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1718b68d05ac43bceb282ced3a6622e4c8fc9eca373f8655e63919b3cdbcfff7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/BXVMN2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cdfe874100ba579c3a0b731fe09b4ce4ea872839acac9078692a063f1d0c53d. 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/BXVMN2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bb0cb1a11f8ad7c84310a2453235a63a89d3a9b2b71dbe4468ca56d34688d9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXVMN2300044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61dc9539fd08b7251eaf118209a0546bd35a23f375aa953086295d58c3fcf0b9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BXVMN2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5965667634fd3ba6ec08647482829be0ecd340514dba92f1b6cb85fccfb113. 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/BXVMN2400024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6586f2a94ca3de416cb8a5c1d814147f18c952e7e200f7c835deb1677801565a. 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/BXVMN2400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b657ee6ec23a274175c6a222810f55f7d45044f4f74f9c3c119358c7703fd33. 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/BXVMN2400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35bb0cb1a11f8ad7c84310a2453235a63a89d3a9b2b71dbe4468ca56d34688d9. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BXVMN2300044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29fe5eca12a09cd1462b1e1f3b32100c62bb2fea67bbd9dfb429e72f5facfaf. 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/BXVMN2300042.