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 0xe1bc3e8d598874961ca436d449f3fde76f4ec7f9874910a74149706a5952c2b7. 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/6c17cae5-2b9c-43ad-ad91-0f588073ecb6.json and https://artists.proofprofile.net/proofs/artist/6c17cae5-2b9c-43ad-ad91-0f588073ecb6.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 0x9b83fd0423fabdfea188ded409593f76180ab4084e2266c05b3e91b726dc411e. 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/QZDA52172553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f7e874748cdbdc4884e6a3ebd950a8e5edf1f4be347e2f266ae663db12e84fb. 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/QZES62114841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fbae2df6730a22e54e7e45008b89afa008d4deb6cccbed68c31e12ab348dc4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN62188442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b03835cfb20e3f9901b296c31ad8242c997649a2ceaad6222cc54cb4d1955a. 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/QZHN92178628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b58a5478220805cc7ad6f089e939117adc63e8a79afa5ef2ce95afb2925c3e. 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/QZHNA2128979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68f4f79cab8d210fefc23b9d811afccb7199b7e829d312b7dc58b2fdd360245a. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNWW2113196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d845b21a41ce78f97eb4fd46f35e538dbe6162d9a8f0634887e2ab93e685d3a. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZDA72285543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa31186fb9873fe2601778ba91bb678bba51c25ea98a9c8e909701ea8cc8d405. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TR0012200195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0550a7e213c8ad7d7fca46f9feb1ad130ba34faa04e26bddd81a6488909cff8d. 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/QZFYX2323314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206d2d2c5839d456214b563eb0665424c8fd745c2bbf06ee7f84c0001f98fa55. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN62398846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f8166b6d9f3bdc00813d9f1419d3d97633aa62fc7f7b36fe51f1d4f18979ac. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHNA2394531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a7f5f12295864c19579b2e258932e7c04e0568a369c27a72689d1901fa632c. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZTB52382083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30070dfba6d274debecc18b1ae7af8d3cd0b99ed2eef10b70effa552c72b8af. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZWFP2309811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56fd9cbe78c873291cad8eb37cfc53e0b7bb5a58bfad44f3c3cf909e56a1566. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZK6Q2466051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a465e98e38c7afc9f96abfeb2e3e054d7babaecdf27dda3c9f97a730835ae1. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZMEN2475422.