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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb69ab1f9da2ecc4ab34fa000b8701b3707be3b4d9be7aa2bb9910cff784cc7f. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49f806b2-92db-467f-b3b8-a74dfa63344a.json and https://artists.proofprofile.net/proofs/artist/49f806b2-92db-467f-b3b8-a74dfa63344a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc84fcb887601d1276affedc6b8ecb6bd4c6741a98f7210f336f3cde64547c6f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLG620582526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf933fcf5c8e1889d4a8af73e975fd3c4f296ff800e4e08e78b66eb244d69a093. 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/NLG620582528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed77ec4194d55f3b1092d948b9383d4f3bb8243391b0505ed7cd7ccc34075740. 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/NLG620582530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e8e7ba6f3cfcb6ec5ce60936969eb833f89a029bcfda4c3cab8b9fd83bdef4. 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/NLG620582532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ba19aa0fc123f00cb648a5c8d05891c9e45fcafe78eea9b66ac00bda938569. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG620582535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15950831f16e3d316d4ae47f5da4989164a108dac6eeaa584b8e68fd31c56239. 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/NLG620582536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf421c3e361524c97f1ee87799b5f253a7a68648933bdbe7fd933475f0fe5316b. 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/NLG620582537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30d0397a686030add8f9894e1e0ecbc985f8d93f2f0da1b611c996d9954bdb5. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLG620582539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c3b46a8249b0f4469ab133425a263292208fdf1a58a447eaef329c62a20a882. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG620582542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bac83c8d5d4009bf1de8140fc9916bff2fcc5d5d720c988491b38d77b74cf64. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/NLG620582527.
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 0x99aae3797c11c0a0b25ad0dc336609ca9c23f64e9b7e27c518db63cfa17e4b21. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLG620582525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1293a5d01ca3b7008293f4f3e0eb8405ea0cfc8586c1ffba170ca111b7ba40. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/NLG620582529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5d79b29579804258fbeb59eca02ea9f12a057253caec05f4fbac9f3ff9f98e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLG620582531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa486021c3f8d91273734d1aca0eeeeaf4464c817c997f44e031893d1a92344ab. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/NLG620582533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275326ac7da70ac9561052d6240f51d1c8e952d8536ecd0ff1d8ca183a3e3999. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/NLG620582534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c388a1c3988f70f6590cd459a75fdf034bd483673cc17946e66f701d018241e. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/NLG620582538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0655d3268db63644c474b80d0a4e240bc22a7c8202248f6a0a29623850ba5c38. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/NLG620582540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3774c8133fcfc928d584355768ef808315e6560f9a1183243826f6cf96b4b5b4. 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/NLG620582541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b019508d73a65c61f16bd59c2b4c576bbf4c854d0bfc279a4643803b6c1f22. 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/NLL6R1700115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f8fd5812e6e3d13372c03db9b360d398de4c6c17f79464f19705e39726e2e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLL6R1602420.