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 0x0288e6c66625d13f58d20a22406b87b71ae258e0b6823555235df5a5dbe4daf6. 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/8bbe6b07-ff06-403b-9050-8000ad88b84c.json and https://artists.proofprofile.net/proofs/artist/8bbe6b07-ff06-403b-9050-8000ad88b84c.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 0x449a72da7cc68cd0f7cf7ee56250deeab9f980ca597d8604ee9e04d3c308ee98. 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/FR10S2446134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e92ce6cff0eed3cccbfd7e6217b7045b2097e043891e646c3a5107e548215a7. 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/DGA062353027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd8a4ce3e4a2fde74162919fea37f3bbfcf16774142e23117e158418808e023. 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/FRX452385929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a735fa4b13a722bc83a7132d0b317a65bff71793a216e79c2481e4456c8a60. 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/FR59R2344150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ed691a13f80c9b696fc6efd1248c82e516be0b16ce2f3a09df2ff2d1fdac95. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/SE6I32449377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2809531502b7f8cdd608a12c0ba9198743a06089cde9f095b7346e521dc07a08. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/INC622216529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933548df31a5c56ab9c1204b31f549b2d93b439587639096ebb43e5f1a86861a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/INC622216528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68fbe0c2ec605ec9744e9d033c34a4ba401fc104f4fc8623c06de8cdf0eaed3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INS172400848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf500c3b090e79aeae0b847cf7f2dfd0ae1f91563839b6108865752058331f02. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DGA0L2378694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee03d846dda3aacb6322b398a257dac808c67daefe07de6a53d17f2eeb16d72. 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/CHF032406502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2ab04499b66df477d6d88da6acbb56591aceb44d7f9524e3b9572490fc1ae7. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/INS172306683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa784fabb725b75f1e4274ade78ad24e59f9a54d91121c84d1a23011219f50ba. 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/INS172301288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2a0a91c5fdfe74298946dd33437784c9817eba95c4ecfc870248732d94e0ba. 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/FRX872200885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05224d4c58af0efb1a92e55fdeea5b0472db8a8cc1ad42bf041c409c6f9dc17. 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/FR2X42195599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43a0ee357f5a5fb0ccda6f7036ba4cb64df7b6a2ad0686f0b59f83ffea3f9b7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DGA052004982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd92803db99dccf4c1691e6441e998bdef26204d66bf000c39c786157ceb101. 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/QZNWR2050483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60af974b784b650c8b49c91c45db6ca9e5abe6ffaf953c0500fd80e0c5029bee. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZHNB2041438.