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 0xc46b6987b353f0df3e9779ce6cf7284e817ebdbdb3dbfaba77d2692b4f13f957. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f3a9d45c-da9f-4b98-a533-1db36fa6de4d.json and https://artists.proofprofile.net/proofs/artist/f3a9d45c-da9f-4b98-a533-1db36fa6de4d.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 0x5167138444342fc974b1aefb760d710d759fe71e12310762151b99d09968aba7. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QM4TX2423038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c9380fe256470e911cc320fe7f8fb548893b378b46b15cd581e831dcb09527. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QM6P42488040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48aa119211c93ce7fbd6b17f6a6246d4ed6ad5dce5da464951916edfe452dd11. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QM6N22450496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1176cf4944ea4b62bc000c1cb79967d2f1cc2905c7e0904b1b5322985f75e90d. 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/QM6N22450503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49169177a277ef68b729628728e7cd62e2b011fe31df47f5efa0e76c4f688ed7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM4TW2448291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49169177a277ef68b729628728e7cd62e2b011fe31df47f5efa0e76c4f688ed7. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QM4TW2448291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c4811fe0f2781c855b215907653267456342be589cf08f16dd8289daf96bfb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QMFME2326402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746fd58d59c4e1f394b08e8f7ed2353ad423a233250c1a49eb435dd07314b4b6. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNJZ2395962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6191fae502db99a9f583a16733b8af82b81e6d99118a3a3edfcf8061ec8d4721. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QM7282369588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb618150f3c1ef6925f59d7e7bdfd6bbe0ab54f9775041698e73aa576f635f9c2. 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/QM6N22328382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5991cb4edbd26e3e963c08dbcb7f258d9d1b7c1d97a57b2cf6f4f14188af2fda. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/QMFME2292192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e68442bdc7b66c04c79e05f6c00db50ae5926b3da7025aa4b7a50da10660cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM6N22263802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c51e3da97e9321971a7510776c0e58f3d90fa69efc012a3213b6b074f3d744. 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/QMBZ92286735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e68442bdc7b66c04c79e05f6c00db50ae5926b3da7025aa4b7a50da10660cb. 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/QM6N22263802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251f5967e3cb68c052884e1994fdcbeacbdf7e57063549aa4ceb0be723d4da03. 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/QM4TX2230388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadf500cf04c95f3f6e4d1b810f485e754692e8b96cc013cc774573e565c9512. 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/QMBZ92187407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35163165a518f952b9c3a70ee0032d779ecdf58c492dd422d61a441c9596e76f. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QMFMF2039971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dfe0e6b80c7dd15dde1daa867b38f3d1c8148bb929d610c1769b1c5735545f. 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/QZHN32080659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb50ac1138e6bb8573ee6b34ecd465e46fd6b3e497a3c6bb76ed239f7d2e3c05d. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QMBZ92400135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3f9c0ffb14f76a1ee7634502f9feb49bda69c3f28266b355dc846214c18cfe. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QM6MZ2439766.