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 0xb85ce627221e61a2d0c166f89d87e5c2e2f0bd7bf2477cd797d3814daf222943. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/159d9980-8f69-42a3-9d04-fe310cdbf4d1.json and https://artists.proofprofile.net/proofs/artist/159d9980-8f69-42a3-9d04-fe310cdbf4d1.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 0xa1686ccc94801c0a05e62d1cef7b1d56da88aeea9888cd783f94f6215d753a94. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZZ7W2403557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3880e2bd395ccaf4d7642e3a771d664307db2c01fc566d663dd2e855229d774. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZFZ32549900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c04b0fcab5e1c4b26afe35dc8c3aa38786068c2bc24bb2ebcfb02a17eb0a4e2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZDA62511303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x749f23d8fc9e89d0dd2b2d5b2912b4d706c5ee5592f617b5172c359862fcb3df. 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/QZDA82535099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2dfa5a76f3b647b1e72215f5c389125dbd63ed7eb1fa7aaa71091aaafd12f1e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN32511560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa313e398627fc7925f7344f361ac23170c6d96b4225b202fdb61b17d9643eaa. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZHN42583155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966eabe116b173b02a09c4cc06035728cc218cfcc3db0185f3016e4e3751672a. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZHN82580978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x379dce6d814d49b4d85117ef0d482aa9caa34cff6ddd732d99bb5b7b29423f57. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZHNB2519853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2b5f71a212f2862704d1a7444c325a74757f1ca8343a36cbee27d5de5f99a63. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZK6Q2594292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d36b7795652afc49c0ff4da1a2ad33afc971be08bad81857d66cfeb2533b3cd. 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/QZK6F2526360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeef9a51720364b3eacbbb9532de70d3b45501660895632443c585c701244e7. 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/QZMEP2509134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853d39e4fde43ba3eead369ca0d903184a01f9a54a3fac4e4d9d8411c1cfddc9. 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/QZMER2581619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79338feee22b17236584ea78d30606e830444fe9b1fe2e4f115ca8189c12475e. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWS2563885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x933018fa9e7ee1c4efbb355e7921245e31f9decf0fa4c36bb1402f3eec7ac4dd. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZTAX2510663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6615f338046cd1a59c3c9df44553a1bfb18944445eff7dcdc4829807a3ad5a7b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB52547843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee314312050e42c48a4e753ff75053b47e0417f447364ef47855acbf5095d2b. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB82564053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca655b8efdb6ec1becf45296206074aa9b58c5c589c74f2bb448b8f43e86e88b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTBB2565379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac296dcf62f443090bef5ecba71b48e97f6f7261f4395e76c9a11b871dbbc1e. 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/QZTBF2500485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa983847719beedbd23eca28335924054f4b69791c2e502aad9b3b4dfa70e6bf5. 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/QT6E82523963.