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 0x547854b840a3c361596e0183c5857305c0c1404db544a0ecc3518632302191d4. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bd5a7342-8517-4cef-ab76-d5cc93e7712c.json and https://artists.proofprofile.net/proofs/artist/bd5a7342-8517-4cef-ab76-d5cc93e7712c.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 0x7bdab874e3ffd9c58e49ced21b4d7f95889534c9d5483998b494f03fab705dc3. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:01:52Z), 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/UST8K1517913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8f96066a29f13851f24b7b2346b87551ca738a6da5b017d91c375ae8023d4a. 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/US8JA1824003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a193848f98bc415a8e24845b5c9333af4c0d3cebe4e4a5546c9d89ca31d63e5. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/US8JA1824004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83b3fccbbff0e698ac0fc2ce3ce4c4a335e816284a883ea9d85f2831fc636bd. Chain 2 (Bitcoin): anchored in block 958399 (2026-07-17T10:39:51Z), 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/US8JA1824005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967d29afb3128080b9a4014ac09924a3745e6d06b3274e05efc57e9a22df7267. 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/US8JA1824006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864541878b845f014cb9661137f94891a3167c7a2c2bcaa7c0e91d01df2c0faf. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/US8JA1824008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff904cf1b3cade3e7e30c3dd285db47bf71930d9092ab4943bdcf412d6d3e68. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:18:37Z), 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/QMGR32089964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12230ad3682fcb5184a2673c28875c663fb7cb33e4d977f342271a96864a806b. Chain 2 (Bitcoin): anchored in block 957866 (2026-07-13T14:54:25Z), 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/FRX282089925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2c9b6c886d0daa3a09212bdf90e5f6f6f9f916c070b468278196d0d5371a45. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:09:18Z), 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/QZSYP2305500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda81d499ed4836a734369c4dfc9d574b4be6907e7aefa578d978e285a4d7b30a. 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/QMEU32416271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ccbefa54d11b587f4df9229631715fa6eab8323c2f53df55ea6ae22eb3c3130. 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/QMEU32416272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4392b8cd905f177c158b42b2eaf2ee01edf00702df6cf1c6a4f37fed4d6e695. 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/QMEU32416273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72df0937969ab2422fe2894ee66a956f6740fb04573e5e41477b85e7eea25251. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QMEU32416274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d4b4640fe85fe1987201bda77b8708bd5f31f981e99cff25303d5f17933d4e. 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/QMEU32416275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4963b4de6e31227a7d77224af61583cf5b3ef9da13942dc30cb3a4df06dc83. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QMEU32416276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04792ad899ddbcb4e555d3982b570d4e718594fb5fc453a9b0b60c2190eb1193. 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/QMEU32416277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b51d0b6847d2d59f27c88d3481c875d328c3e7a95bcad4dac5bbb08989af2d. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZQAY2571565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434688a2749a2e3ec900a040d9ba161b7dc84ab74a7c5702a70163d036ab64b2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZQAY2501033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a84fd55bbdf54bad2ee00a50652a8475ff8ac58261a9d0f02c0420cdf86286. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZQAY2569411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5238053f42d56e888ba2c9980331101f0d23e76f174c5291360be137d3649ba4. 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/FRIDO2111782.