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 0x1cc6af767ce7ca207127f334dbe6e5449d8e79680cf7c633f7279a87da994055. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/336e4a9c-40b9-4d5d-829a-170c6f12f8b3.json and https://artists.proofprofile.net/proofs/artist/336e4a9c-40b9-4d5d-829a-170c6f12f8b3.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 0x8c7fe3cf1d81a6fa67e106190a75d4726b5747de2358dde578ff80496254737c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ARF109903195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9017977c9d5b5af0de4e7bf81ccee65d7c35e1dae14d6c896409ade6f2514583. 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/ARFSB0600514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f477064c4bf86505849f9d9ffae4e460db01af756dea64b6cb1bcfe34832528. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ARF109903196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9bef8450a1a7e6894f886b222c9de0c293c490ea88c7447f760e0d6ad00acb. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ARF109903197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af6d4db12ea27e3e5fc1df5f20d925f411426c37e04f2610ff5591ef259b0ee. 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/ARF109903199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a19c0b6554525502cffb5b79cbf879b9d93dbbe3518bc2bf53d0902f8b875b6. 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/ARF100300798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7485e7c82d6e6affc07c179ca34c0efb6f9bc59a2f2276007f4f4eb9ee1705. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ARF100300799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab0212c55ccea2d013f9df24a6b174151912a6bb1b707f0d8beb2564a3afaae. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ARF100300800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a55a73feae115bc3e41aa5968128cf74776336a1e67322a2a896ef183611681. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ARF100300801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3e1ba775e5465a4dc91caac2e9d6300ceb197faa5d561a8dd07620e49250358. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/ARF100300802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eabe92dd1fa8d69a6f61e36c98cc891bca592581c3194da98fc881277c3184c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ARF100300803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd2156b69b333a6724147d850fc8010132cdbbf3d967efd18af9607b4795878. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ARF100300804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42a1176517f4b0d9cff9195249711dbb9f97d7140b26838c1532459a09c6423. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ARF100300805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1525fff693b546ebeba49b7d1ceb8f47452d4671044fef5cce03a80cdb5258cc. 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/GBHCD9500083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7330dfcaed855e5b1b3096136aa49f757d748aa11d22a89c4010a20459d79016. 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/GBHCD9500084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf698f092a31be1e0d1bf017d43185617149fb52c7f20fe17ff1aa09e73658b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBHCD1726561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cec8d45087da5a32d915c4e86bc2eb00d89290ab986c58ab9c5ac03cbbbed22. 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/GBHCD1726562.