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 0xd1e8e87bbeb627471d019348973bc89e94b08110a7cc780ddfe82520a171c52e. 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/8954d4cf-f1d2-441c-bc72-3f6789acab46.json and https://artists.proofprofile.net/proofs/artist/8954d4cf-f1d2-441c-bc72-3f6789acab46.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 0x0cabc5f1c8463fd0a1721d588d7eda13b2e04bb78c463064335b92fbdd302193. 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/NLYK92100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6046114cbeebc7aa4d367a020ef4eded8338e4b5b2887b3c5a4c317a2d75aac. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZWDW2370298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22909a28a29b21fe800b2826da74da0c9a63464f6fb01beb82301b62c14043e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/CA5KR0033016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dd9248dfc71c5e66c1c29aaa25d4aa6d15a0dd287a44d8a3cf7f0ce5027d44. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812196917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9238f37c9d399be393442bf009aee86afebf63e192a59c3be4b33d9423691a4a. 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/QM4TX2192379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c899cf0c85ed445f41d1982b523daa5179a30d011d3012af9f56e5c2d87502. 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/NL1DT2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb858f9fe9b6fc1024a7a592442be2be069d193db445fe836bef5e45d718190b7. 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/NLYK92100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fe3647a616c9e0977d57288f19491ef9604a784227417d1c1b8a9b7bb25ebf. 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/QM42K2103586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f00a5a1b2d346ef1d52de56e96db10b10c6f373477ba5f11af9db474bd07bf. 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/NLYK92000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d75fb50aea2c8da5214c6fac71dcae77f2f1e36dc1e46adb9387060e15758f0. 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/DEE862002599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033085155211d0ed2d83aacc8fccb748b94ed321c89663d8e9010039ab9cc952. 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/NLYK92000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e59546a145833213d710c83484b1b048674e1de1f1582a7b1cc1dfea924c9f7. 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/NLYK92000035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cec571b821f960922cfa0a261a8530a836a3d53c0d635027160c81e281abe5. 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/NLYK92000030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4ce3fd871c230c1f74808884aec9c1f4f80020c39c4145d057cfe349ab9070. 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/NL1DT2300249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39f00a5a1b2d346ef1d52de56e96db10b10c6f373477ba5f11af9db474bd07bf. 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/NLYK92000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e59546a145833213d710c83484b1b048674e1de1f1582a7b1cc1dfea924c9f7. 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/NLYK92000035.