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 0xc2e6a45389bf8274cf6975279a2b7d2eb25b63cf364c4a8920e89c8665fe2ab1. 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/3a396f7f-73e2-408b-a69c-7a2522e03e93.json and https://artists.proofprofile.net/proofs/artist/3a396f7f-73e2-408b-a69c-7a2522e03e93.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 0xd645537240b5ddca771eeb2265a7ff064273cebf5aebe90c44ea4a65e7fdbe56. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZ8WX2058327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60acf209160b2a187117adb723ada3203f93190310416da223d992035b73ea2e. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZ8WX2084819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfd4ca1f447e0049760b45ca2c976a8fb200c128ca5851c9fe6194d4e1b0c989. 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/QZMEN2210453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f69f40ef3ee31d5fdd898a80da76cd1cd4bab5be815779a6625c4f88e09aa3. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZMEN2210456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c46e65efdf5713712b55f48be4f60546bcf932a7a1877fa62b8c3c3edc77f21. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWU2211421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf236287253072dc0dac914a02e720db1fcba496a1098bab10b54cfb835269e53. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWU2211422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b8abbfbcf55a61902d3e534b13990fae5d2ce2044f9474dbe949a2a0553f859. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/DKD3Z0013769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409d9767be97752d7c456dae3b0d97269f2c298e2bd847da38139bc6e7dc4735. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZTB92212707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58a3af0c63dc24ec2cf64b389c64c295cd156047ccf9efccd91209e07bf7f27. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZFZ62370473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0614907392b5178e2d1e195c3daade3c5f07a082dc27901496e2b431236deb9c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZK6K2396130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a328edda51b27cbe26251516c3e13294afa6b6c66ee01f05d3598197e95f9df. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6K2396134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e5609b95d286835a225cc557563da0304189316c89e4e317b371de628994b9. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZK6K2396137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94bf280f252b04335a2025ddd0c21336102d813739d760e2dd09b397bae3cd3. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6K2396139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bd2678eb629c4048a855cc6604798d9d5849a87274d79295383fd7e3806a641. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZWFN2324523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa20214a519931f3db97c0fe6824ae638c8c1f7726afd46a06cabfb736c199802. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZWFN2324526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98849d6e629e77b3e9dfa6e9770cd2c68ad5676d64d88ffc8d791e647c3b4bee. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZWFN2324539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x969ec420e960f69a0f4a1a2c99b6b54c27df11fa13106241bfe1c5bdce5cce08. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZPJ32379645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9396cc8c440f32eea06caabf63f2fef4c6593475098fc4f5fcbfed37d6c0370. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/QZPJ32427771.