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 0x8ced100712abacb41dbae14872aeab3f95ed2f2939e64e7303c1cbc394236c09. 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/447f5db7-d4da-4086-8283-2b5052a83d8b.json and https://artists.proofprofile.net/proofs/artist/447f5db7-d4da-4086-8283-2b5052a83d8b.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 0xa42461d78b29754d2d133e7b39c5164e09b91976ed56628af45b4211ac7758c4. 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/QZDA82320984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af29e1b79f4c5bd3964f7216da36ad51f022cb4a87b2efc1c504073f7940639. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZDA82320985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653f71420e978ea20219f3a3ca9135d3afd56b19dde8f47e26674d32c878da45. 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/QZDA82320986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3135b22c4a1ca4bf5a933216122157d12d13d90f49bcc9ba40de4494b7d6c3a. 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/QZDA82320988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89b4e9bbd99ef2b6a44ecebee225cfbeedd1b494d5d6fa5b842aada13916187. 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/QZDA82320990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed00a44532604b2d24f5b5c2259a811eda220663f1be077cf1c73451e4c6cea5. 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/QZDA82320991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b4ce67e04725365ea33cd6084fb22b74ef7b10ac571a442cd9862d9539d5b2. 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/QZDA82320993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fb6843730eb6e67c164302c71862e424bde8a9aaffbca5f85c256098563fc4. 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/QZNWW2330267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc15b8f10ce0598ef743b09551636609a48f133a069d9728b5f25110776a499. 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/QZDA52402073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fc8ba3a70783288ddb0d279dff96f7ccfa7ed7dfe879134f7d0bcf2fa33b33. 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/QZTAS2442654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1a80e652d289ef0edf5622f394b34234ba33a77247e6dde48542d20faa4e529. 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/QZHNA2416558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aad89d982f7888fb94450f80774102a289b900234a4cec61b8ec4710f1ab075. 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/QZNWS2281248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5f660ab9628827013aaee053bb3e9c5903a1307e6bf90bf46bae028aa518ef. 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/IL7532421551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd439900c9a29e409e42d9797c823980a1779883cea98c04dfcd6081d0b4e65a0. 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/IL7532421552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5996d82192d680ccac0f749f3d4f37c0dd18ce689dd75328af988a5098564. 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/IL7532421553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f5518e25e48ab80ef8185e4f18c910739f0c14ee6be131ecb495fbf91f1090c. 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/IL7532421554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd644ebc90ce14226397c964901cef73af82dbfb83d2ea36e03f9d92ead41ccd7. 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/IL7532421555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1a36e1a405de0298554a45115774f40e8f366283d1d62c75a79a34e9e6ab40. 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/IL7532421556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e76ef5fb674da753a173b2adfa93a91a6d5dee8ce3e7abce6ce1d5f1b2cacc5. 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/IL7532421557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702abe5d44489f7d02628bb7a1b3b3b0024810bb0c90914d6f1bf932d9a72e0c. 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/IL7532421559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dc6fa9c7d9016adacc0775c5fa258e70c2327947391078d681d5f1781f2d51. 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/IL7532421561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c26a8633f7ddcbcb88858dfffc5fe0973bcf53d2e7fc56b13a249d0baba0408. 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/IL7532421563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e0000d377e7ee6b78ed837082e06b893255123fd10b09a54a9bc84d3b28dcd. 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/IL7532421564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357edeaecf0a2f19c21732e6fdb84351e76810694153cea06c649a89041c13c3. 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/IL7532421566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9186f4a05e1e3e1599f5fb30b4f00a1ee60e5ada6847f824234b7c1181401c5f. 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/QZNWU2411141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11819f64d22ad678dd1ca057d3a422546bc16af213c3803d29afaea014bfae2d. 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/QZNWU2411143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6035c49cc49013de4667dbd11ae0fb3672507455e9aef4e3389e139cc529efd. 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/QZMEQ2334181.