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 0x88441f4b6fd5e303daff1f2afdf080d0c0cf8c3951cf219411548cf660ef8841. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa87fd82-ee25-4e36-8dcc-aca45a77904e.json and https://artists.proofprofile.net/proofs/artist/aa87fd82-ee25-4e36-8dcc-aca45a77904e.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 0x0cd90522286e200462985600a15ea71cfec922d5cbc0a2bca79f13dd7c55d8c4. 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/QZFZ32394213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89d83157af1be628c80da8eb076f38c9902fcdfa14f082269770cac8723a5f0. 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/QZWFX2414960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3252f6ee97a1d9ca8a81f1851cd862a87963ef6ac54da7cad1dc535c660601c5. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/QZTBC2499873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1a7741e92dbf69dec7689635c32190a71c2a07e8f7742bab473264ae4f703a. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZWFX2414961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae526fadf089be9e230e322cb7a46d9679408637f0a41dee04d2081174abe4e1. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZWFX2414962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503c58fd7bb86366d8b8c3a60d9a0b856a3b5107a2708dae0a3f506c67fb0931. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZWFM2426180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20523482577f12f1bfb4d29c71ffe027823d212b0e1e7a2190d9c1e948f5e865. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZWFX2414963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d30a5a5bcf21ec24d775644b822c2be5c64e1cf55e3c4bd627563beb2e19a9. 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/QZWFX2414964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42563fc0ece1910f7a83385a78f47681ecac08b04abc525e11f1d434c509042. 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/QZPLR2161138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09a868a37d5021e7f0d28c85644a8b3e0af07e4d00a5f2cd3cfa3d9f80647200. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZPLR2161139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b217ac132290dc0b3f3b225fc7b8cfcf77410d7afba855254a6ae4cf7554bfc. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZPLR2161140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ee2ce358da1116e2b5e2e9d100b2870ad5029348ebc365f93d9efe389d8501. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZMER2158942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118074850ec149d74a77344fe774d2c40984aab802b3c584a5252abc545a4d0e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZPLR2161142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebe4499b0aec151a38910bbc22b1fe7940f58a5fc78eaa3556ed1402289bd74. 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/QZPLR2161143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x503c58fd7bb86366d8b8c3a60d9a0b856a3b5107a2708dae0a3f506c67fb0931. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFM2426180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3252f6ee97a1d9ca8a81f1851cd862a87963ef6ac54da7cad1dc535c660601c5. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZTBC2499873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ee2ce358da1116e2b5e2e9d100b2870ad5029348ebc365f93d9efe389d8501. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZMER2158942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f209c4f1dee2afc35fa0bc4dcdff78d03756c92564fc7f5e966b26e21231a3. 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/QZES52074897.