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 0x8bde53f78f3039abe236042d91a088d1e29e7d1f157c3f6f7cf4af4af2d65fae. 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/c9e65f1b-b45d-4d94-a74c-075373524123.json and https://artists.proofprofile.net/proofs/artist/c9e65f1b-b45d-4d94-a74c-075373524123.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 0x0546dac9d29bb1c549960665d2a71fec648e9f7a2acbdfa3126ca3a8260a319a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLY7S2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3669d5a346385565a1fffb4ee174a483a35f748f7299c3047be82bff0aac132. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLY7S2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0bd5fa7b018bddaf28186c7454ea24ad1acd629974f69f0164648c13f41298. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/NLY7S2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8f36c275a66ec0d9d55a9eae687ab2541f7efde2667c994af92db2a019cdba. 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/NLY7S2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5105a225967be021ce1f1c38a2b86abe87cbb12c3ca15d859bb904f5abe08ce2. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:50:20Z), 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/NLY7S2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8f36c275a66ec0d9d55a9eae687ab2541f7efde2667c994af92db2a019cdba. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLY7S2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f3a0dca13718c39b73639d40dd818b77d13a512a39fa254d9731c8d64e941c. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T01:57:47Z), 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/NLY7S2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f23e36438c6c9cc08ee14afe8278e11e3ea52eebe118cb2b8021b458e3a0795. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLY7S2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5105a225967be021ce1f1c38a2b86abe87cbb12c3ca15d859bb904f5abe08ce2. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLY7S2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e38fa9319d2e23609dec9734e421f9a117cb5e9d13f41d7fea3df6cd9b894df. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/NLY7S2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f23e36438c6c9cc08ee14afe8278e11e3ea52eebe118cb2b8021b458e3a0795. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLY7S2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5105a225967be021ce1f1c38a2b86abe87cbb12c3ca15d859bb904f5abe08ce2. 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/NLY7S2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8f36c275a66ec0d9d55a9eae687ab2541f7efde2667c994af92db2a019cdba. 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/NLY7S2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9f3a0dca13718c39b73639d40dd818b77d13a512a39fa254d9731c8d64e941c. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NLY7S2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e38fa9319d2e23609dec9734e421f9a117cb5e9d13f41d7fea3df6cd9b894df. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:02:05Z), 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/NLY7S2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcb5c78930d4e84c58a298d5efc008377d65e3047098890314f80088ce3aea7. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLY7S2500006.