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 0x2e81964de8192f1c8fb364fba3c235076ee1aec6ab5cb49ce8b6cac9ab402c50. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e169dd63-3c4d-4c4a-a319-9a8afb50ac0a.json and https://artists.proofprofile.net/proofs/artist/e169dd63-3c4d-4c4a-a319-9a8afb50ac0a.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 0xa46e131c1b44e2bcb44b018e89bf2a732bfce12cc90c62d660161c74b1ceac1e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZPLR2557078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b226627d753b6d4a4a1100938598a5848c327fbae743f8d8468dc4d2a256f4. 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/QZPLR2599021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cab52e7629198eccba9d58e195a30a8f5b321fbc270b27b51ea5b0018ebfb3. 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/QZPLR2597411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55fa6d6555f84cc10ad700014cab3463ff054e72937589d83d00f04c9949d8b. 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/QZRP42522984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba9f7ad66af8a69abea8f6105fd5d985673708549c0501c41b783854f9eda0dc. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZRP42521740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe3bfb708c7a1befa1105057cced69aa824ad90696b50322cf6698f34ec6bba. 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/QZRP42573476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c84670704e490c3d847dd4837d73943ae49c01d42a45a7a24bf433a50bfab2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZRP42571508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9002bf44df6f773961ed4add4d909675a45d37bbc55566e23618c39073b29b9. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZRP52513327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6864b0c939fe1983b92f3e6cb403ae228b5d966fc9a916c169512c618f7d963c. 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/QZRP52515152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7f443e190c3e9845ca6cf9786514cfd3fbd37ee7df18c22a529b574acb19b1. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZRP52587670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59081d7611eb1396a34f7a2c94bfecdbffc48e0c995c920c0fa07d1d250bc031. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZRP52585333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d42d9ce1cc47af24429ec79211c4116e0b0349d6b7774960801f60df95a8709. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZTAS2527260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7a947e034dc8f8348c383dc032ca34d97163c57ed40a4afd5927a64a79ad88. 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/QZTAS2525333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9507f10cc095fba585ec79f7f0124c330443cb7202052193c0e9345059bcb0f. 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/QZTAT2534493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f52a986600400b6abb3f6f1067f92ca73b66f3b21ffcf52cb0da4f6cd5babd. 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/QZTAT2536378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3987c15060e3ddd2b5862329ec66bd548c00022a6e894beadb4e37848f4184b8. 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/QZTAU2505545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4bef152f95923ba24c618f378340708f61a1a47f422cb773efeb909943ec9a. 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/QZTAU2503672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a58a0ed39dd40bee74d89ebdde06404dafcb57c7105daba4a7976fedd90e14. 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/QZTAU2521188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x884bfdb746ed81cf0e5aaa0e45de562c26b679e960a875009345c7b267f339e1. 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/QZTAU2522768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70643d781d5452cb51e24f802365c78366fba7aca94b53986abc2a7d10cacb76. 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/QZTAU2576834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5a9783fd1e05ed0a5f3a1e2b60c003669b87491aa97ab8334c11ff39f3a25b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZTAU2575565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60dd8aa785d0155741d06c8b90d7b1483ea295d77f1382e2684ccc42a56bcc5c. 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/QZTAW2545904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e98cec36ecc920b4f38d493b9327a1ea87dbf22e1c09477790ec924243f1868. 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/QZTAW2548917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba032d8d44d77b31c6a513677f740de0ce612f49bf5a2eece265ddb23f08932. 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/QZTAX2563599.