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 0xe8dd34e0d83b18a3b417959f7af65202f340fc4166a498c0401e0414a4e4cb4a. 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/35063f77-d035-4e72-b07e-203814ccecaf.json and https://artists.proofprofile.net/proofs/artist/35063f77-d035-4e72-b07e-203814ccecaf.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 0x1ede5280416ec55adebe25954724cb08cdf23cc3fd51219fdf5f417a2551d64f. 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/BXCPZ1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366b8c60742116643a750d004ec787d36121fe75b2a0b81b9fc87f1af592127f. 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/BXCPZ1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510f9523dcff30c096cf5da311528b28d97d0af6010b08884074695a8f561cff. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/BXCPZ1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d13912d18bf071d8cbbf8627d0d10fe6b15106acb175b378dd530617b9abb8. 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/BXCPZ1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87450250fb8371e55521f44634fdc735e6e716c51760435839df89498c95b511. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/BXCPZ1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30749608ec72bb10e7fd4c466afb0039437b9bb5c24b320776e588ce5aa02a08. 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/BXCPZ1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeced89b74deaf9d1ab1ff4393a6b60af05f8964d04c0ec2256f76fa1c5bdf4bf. Chain 2 (Bitcoin): anchored in block 960165 (2026-07-29T23:29:40Z), 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/BXCPZ1600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df4b0b8456839a8d98af2931b58e1aee5e786ef7562192403965b0f54f1eef8. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/BXCPZ1600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0cd6a64a5d6130a289a914ca2f2b2a332595675d39ecd7a07f92260bbef99a. 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/BXCPZ1600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fcf9c985c93f43b34a53ee35cac6594aa0f28a7649c46c1bda25a85e563a52. 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/QZ5AB1707139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09347d91c734fc9f983b0d8083e190a8bb811b4c37ca68c876d5ecb624f98c00. 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/BRHUM2100028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01e23f0304ffb05c2e3c3622641cef5f34bfa109af208fe2f3cadfaed6beeb1. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BXCPZ2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e6560040f64dc802a28b29340cf5f704ed2325fafd9b6d45159a2afb9ff5f9. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/BXCPZ2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd430618f3e7811ca943c43dcf94cad3aa1b548ff98a98cadd63716df2a4c9f8. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/BXCPZ2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ed9d5165ebb8e9d747c7ea11009980caf0bdcb856141d15c7d8e8395c222f1. 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/BRCQE2200080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc3a922125b271de0fddac09401a680d59a0eec8600c07ae9ac10f0364bd9cc. 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/BXV602100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b067312377ce5501b0d36b34eda8d22f572be50be8eafd6bb7b27701c559a1d. 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/BXV602200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a986cd98344935bfb96a58c244399ef835ecedcf2261c3e72287cdd8488187. 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/QM4TW1899346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553296cf41614549878b917bbe5bb369c38ae70f59b96328ed6513c93cfec411. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZNJZ2440466.