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 0x00a0225a6a7e782822693f95a30cd1fcba1c446774ba75143092a75a59dfb316. 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/6b77fc7a-e66d-445d-a67f-f872a9af82de.json and https://artists.proofprofile.net/proofs/artist/6b77fc7a-e66d-445d-a67f-f872a9af82de.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 0x40cf133a659c1fbfe1baf92d06b0b51cb021fa4f8b30381e58d1b68c946edcf6. 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/BXG6R2400608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3948040f2cf2a66b75f7406e8ada49cd47770647a9a363058c49748bce31605. 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/BKBSS2400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf027920a8460b4f24c236591b5397e376f0c9b7e21d38a627dd97b951aff2e68. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/BKBSS2300253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eff693b97363a0fc8606539af20106eb56b1b0630c4f33aff1749314977d615. 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/BKBSS2300190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a205f846945d432f412a9d3e6c549a627cd1d1e3f6369f06c7bce889ee118f. 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/BCGUH2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666f4f9739a4d70a14f65b8f1865ae04dce289af974c7c4d5cf3f426a50279b9. 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/BCGUH2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb953d9da07958ad5202a5e8a20038c2b5f6ac46eb3775507ae1b0c48a6483b39. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/BCGUH2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d8ee98e18ce9faaa0acffd52e7caec066da715435f191ea929773e0f27b6b99. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BCGUH2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa882871341ad645fc7de6a6f9a0e250ef2677406cb9e0824c6e8822b2ac91358. 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/BCGUH2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e62f9aaab14ff7c253c840710c18247c6a26fee99ca4223acc7b01aad6c9571. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BCGUH2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9285071d261ab9759e61b236c9a0f7e40a4bec413cebdc139d91f483f61a8a26. 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/BCGUH2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf95e281487e1f85d77c68e33ff18d924b659c651bcbff03829ef10f4b4634879. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/BCGUH2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c747455c6aaaae8085af841bb2fc7c7415fdaed6510db6801c446baa2202b73. 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/BCGUH2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4c608f56ffa9f8ae169b9bf603c9fe1dcb0e0d79531a8f9d3f2461100ab154. 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/BCGUH2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091268af82a7061cd31369430d5b80e8a4927834c9555ac50aa8f1c49ffb5b94. 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/QZHZ62085335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4e75e21b9953a228ccfa46c987e3906702beba1e58af11d5bc27c9dfae3843. 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/QZGLM2086082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc34d7d6dc5e3042bb6eec3e02ae171e8038c98a45cc2f9f9bd8d26ed1dc0844. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US7VG2070140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b377645a8787c00489f8f63aa4f778467b54092e2614861a2298c0877dd58c. 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/BX7P32300676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d804731bf9d46851af62a80c2a162498961b9df6caba3c6f356a21cbf85cd7. 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/BKBSS2300407.