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 0xf1c4ac62de726b8bd61f6cd9240e140544348e4cea0947b5676700a8d9ce3be0. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bf0b879f-6b7f-4866-9f94-b4e72285bcb3.json and https://artists.proofprofile.net/proofs/artist/bf0b879f-6b7f-4866-9f94-b4e72285bcb3.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 0x000e90b1b2e89b1f009643857b104710cf6aca832449ed2258a8e8d333a1adda. 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/FIWMA0400402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48265fe39eb6cbf9abf6c1077f20dd1097bfad10debcf16342b639f31acd4d0. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FIFMF7600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b5c9f1d9d5c27a96cef2cbc460b819d7bc15473f12f85ca3d9a15db3c6789d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/FIWMA0400567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6730a0c87ac48dbb0769e5e46557615f1cb0d790a0f1515a6010913ec2cd138d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FIWMA0400569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd5f2049cfe4b7c30abfc2822eff0e3fd2e4986999da0f1cf77e4261ab7c0e7. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/FIFMF7600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a1307986e8371bc769152c5102fa331dadb544fd66726ee8591106e1c0b472. 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/FIWMA0400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d216f4c5de6a1fd658ad7b8713b7b8e27f6985d3038dbbb98874dee9c203053. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/FIWMA0400576.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48265fe39eb6cbf9abf6c1077f20dd1097bfad10debcf16342b639f31acd4d0. 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/FIFMF7600400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7439394eee46c09be7b2b5c86eacee64c93ae9aa0a2d771ab9ba207e54e35f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FIFMF7600900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b5c9f1d9d5c27a96cef2cbc460b819d7bc15473f12f85ca3d9a15db3c6789d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FIWMA0400567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f51d7d7e8ce694da1b98c9ea877a43a83acbd290a7481ec8cd4efedb006e370. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FIWMA0700524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7439394eee46c09be7b2b5c86eacee64c93ae9aa0a2d771ab9ba207e54e35f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FIFMF7600900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b7439394eee46c09be7b2b5c86eacee64c93ae9aa0a2d771ab9ba207e54e35f. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/FIFMF7600900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6730a0c87ac48dbb0769e5e46557615f1cb0d790a0f1515a6010913ec2cd138d. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FIWMA0400569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fd5f2049cfe4b7c30abfc2822eff0e3fd2e4986999da0f1cf77e4261ab7c0e7. 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/FIFMF7600006.