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 0xe95190a1605c43b68397265c01405778469011a3f9c9876ac9ff1d7ce8383814. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2444386d-7ddf-4bd5-a4fa-b767d933884e.json and https://artists.proofprofile.net/proofs/artist/2444386d-7ddf-4bd5-a4fa-b767d933884e.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 0x768b7b660d173a3254b162b93f7edac9afcbde55bee43acafaa0851b9018ea88. 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/QZHN42332021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28efd6dbf20062b0eeeb358715f30ed12bd1eb07294852e6138d4ef5b299fbc8. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZHN42404922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f60223f0675918cdcb06d6e492abe48a6df0ebf8c3f2564f6f83150311ad46d. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWV2446170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac87ea7781eb4bd25e63a4d8ac62ab8a22d33da94355689f4b7c55069da957a. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWV2446173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb92c8b6a62b76251545a2db06ce4beeedfbce29f0a6de0699fc872b41add93. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZZ7P2411384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde98c222a1889ac0666356c3b3d310dddc3c108a05dcee9e81fec8c6ccf57ac1. 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/QZHNC2538484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff910617474a789ea43e66078c421a08bc0a2f161c377395d8c9f774fcaefb93. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZHNC2538486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bd9a23ea469621f4e5b96bb9f9e391890a36a1b5e4a898e44aec0e914e8bcf. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZHNC2538488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa46adb8847010af05bc5d22ee3fe109bc578309a1b0c8856a4f06bf2c6af7459. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHNC2538495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca16eb2d4a2e6ae0a6278388156861042819c164b9f6f32b471fe8cf7fe30231. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHNC2538498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ef08d9eb93ddc1a5f230dce7444e3b448dfb36156b68e139c09d6335b82b18. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHNC2538499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eacc4b34fdbaec93c269c11f1934322fa078e8521d81a47f0140caa9e1a4398. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZNWR2522326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1350ee83346085c72b191adf12e70dd4cde0233c1c7b83820ff83275cc6fdf8. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZZ7R2586463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0800e16d2cf89ea4e3864ce25273f3b621b80e5dac9c68d616c7caf5774751a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QT3F62558918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2272e078a78527ab7f9e6a17e79a7acd4ab0cca816b12005b63075bfb5ec76f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3F92594184.