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 0x0be866f77aa372b2e4fbf3f0766943a009b409c8435f501efb51b478075a281f. 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/95ba9228-b54a-4d90-8b19-9de465645804.json and https://artists.proofprofile.net/proofs/artist/95ba9228-b54a-4d90-8b19-9de465645804.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 0x1bef81a73ef53dc1651c3575e764a7e058b5bf6449064a6a0148d79232641d73. 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/QZFZ32317666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d38afcf6775626498c10d5e45ebacfa766fa189b5206d7e11133e01538d8710. 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/QZHNA2336843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabeabae7abc25c0dd4249dec4d3461811806c93321954dd593ea8cbafa411a25. 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/QZFZ72331086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b13f285537e3d71766cd7d41ed87bca3c3a102542b01b050293585f37fd45c8. 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/QZHNA2336844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa78a45b96d9d0672764e64c494b2a4a9366df0bab9e45e384a530e3e547aeab. 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/QZHNA2336845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f94a9c0eab7f074d54d77ccb4c9806d99b74b92ca372cc07fda63cc04212d14. 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/QZHNA2336846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabeabae7abc25c0dd4249dec4d3461811806c93321954dd593ea8cbafa411a25. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZFZ72331086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bef81a73ef53dc1651c3575e764a7e058b5bf6449064a6a0148d79232641d73. 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/QZFZ32317666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02e0c64f8e5983525b70b07b1d71b32d007521388eecc9fc79901910c4d9dab. 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/QZHN32255285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8edefcff02ee6c9b4359160877df8c6990896483e089e8aef730e24e6b162e21. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZPLR2140254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f38e561c45a1a2cad9317f2fea4f61a7b3b45b08b5b813b0eeaf997f504f559. 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/QZNWT2150438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c78f4eee82497998165b3df88da5e43554f192ee85c402107151b1558ac3aa. 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/QZMEP2163110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d286daa2fcd5c89ec4cf79eb182725903d9ebe39aa4170fe49c4ac2b275b16. 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/QZHNB2153362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd2de80e2b67a89f9ad695b194aa507fea618f62e43ab5e7259245e66dff888. 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/QZES62177214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75af6b2736d31248854c6cc32be9cc040f53109fbdb92649b28e7fc9d240a484. 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/QZMEM2074983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d66aecc1cc5fa3fe9096b6716fc9f2daf51c0a1e9f78fc28ede07fe8789d4a6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA82016747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a488415950d6356fb36801208f4b642b7bdccfe3d0e4c931e5aaf3b8d0e0c8. 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/QZFZ22065900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f86839dedca7cdf23af4a5eb90df7fdbbc610118d1f75065d7106f2ec2bc91. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZHNA1913508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c2daec1002d9ad9e41bbb8e45885a92d19abd2f4d90ccca9fd7839a77dd03f. 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/QZHN41953052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4090cd88276ddf05a49e7d31f2d40f35348f778acd5e95c996f83a47bbd1931. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHN41952333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a4f4a609499db36512560f2470439ddc7600cc57f3d08b9848375399c7460f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN41952335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e5c15d6001694a2dd4f9f1bc9e9b52a80daae6b670efbbd0f2896572d29f9e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5AB2294130.