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 0xb9dd59e5f0e90c92d462e037e1e95ab2ed42395f053eb6b7927e20641a34f248. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/350db6fb-7150-4dbb-99b1-1157062e9837.json and https://artists.proofprofile.net/proofs/artist/350db6fb-7150-4dbb-99b1-1157062e9837.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 0x6a4ec304d9285044aacdad0abec0e877e675d51f0dfd0d1e1a2e2071a62d8528. 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/BK7NM2500180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98e1c6bc5f10094b84de3dba156e5ad670ba3975f9454e7d6f9d9b331c97556. 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/BK7NM2500188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab1bfcea06c6dafc870a2340406ac8c8fa98d06e735fa0f772a564c49a3c4a2. 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/BK7NM2500263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a6c7933f3220cf9898fd10f43d8ea59cb04add05cb4c68c32c3d35a9691933. 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/BK7NM2500264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ae9959f37d06b25266697fc4c89f55644004bcc4d18a0248785437c2eef220. 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/BK7NM2500265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43953efd5d1c58f0204d293379e2bd71dc03a430445a33db85dc6b67dc8b9ac2. 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/BK7NM2500266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee5bc530c1e5b3f6a40227322db9b6d13aac85329062e0baef4defda67c0b78. 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/BK7NM2500267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd72a6e959826f310a8506eec9852d3480111cfdf6d0d26a7239cb9ec6a1b3a. 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/BK7NM2500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b1619749a3d842533b85e96032e280aee0663cb07c4d86509435289120ccb1. 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/BK7NM2500096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8e13923b5973de4a0d8d2f97c38cb7f4fdb34d4bd73689d245e2401bc5348e. 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/BK7NM2500097.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4642988cec336dd7b2f6e7f27ebcac4b8cd0bed0f73b38429045a3b0c5353bb. 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/BK7NM2500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363df5e80c03bfcf4654a3a7243ad7f5c57aa74c7ba5c9c9a018ac49245f48ed. 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/BK7NM2500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b594c0e378e2f2943bc7f8caa6a0f8d49f9b00631f02d534abf6a4cff549f6. 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/BK7NM2500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5285f72888e9a8581a180de044e803b261c26c232be80933ae75cb2c2498262. 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/BK7NM2500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d19c5297d90967ab4c8770d6f2e753b3281de60b0a3ef6024333b3e0e90f373. 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/BK7NM2500101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b3a9fc0f93e32adae9a95eb9bb362ce2030c826311962855c64f5d4428f18a. 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/BK7NM2500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe363fd46f72184a56bfd000b50ff95221a35a591d50323db899a1b9aac9652c5. 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/BK7NM2500167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f53882a33cbd68623f71ba2022f0cc4881edf95068c78347aafb72375758cc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BK7NM2500092.