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 0x2886cc20ab03f67131f34e489da3b699a77edd4c968465c52bda0ddc58aa16dd. 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/8cdd489f-d30a-41dc-b35c-3c176d48390c.json and https://artists.proofprofile.net/proofs/artist/8cdd489f-d30a-41dc-b35c-3c176d48390c.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 0x8a603cbfbec605342dd6f0885bb0c7ca1fb80467e805d397deaba6459f465aaa. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/USQY51500147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4435469e414f6ce736cd65b4a88f55ee0dd598da0a8edbf3e963b3d4a1b89ef8. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/FR26V1624072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec20f1c9a15d0dc22ba4bdb90d94ed8c79409aa1f957345424926a5957ed82d1. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCADL1871737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921e88967ed53044c53f499c369f929446be6e243d1f4117c9def1a44a9957ed. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCADL1871867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e2b6cfbf1a5b6f5ae0e21f727e87ae23b3c2fbf82ad025ac70992d51f5c1ce. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/TCADL1872110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48149f984b1b52351d8ec1b244fd077cd4b9c5b8d4c6f1559c9bcd3526caa0b2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAEM1906411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8967c3e794af0c64d6af3b8441164d1e7053bbb54e8971dd32a75e0548c1ed3. 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/TCAEO1976407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17c39e3b8c8506a7c98b0082ee0fa98400c9321c52e773cfb30000145817646. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAET2086328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661d73c93b504d692a8417f6dcae5f59d47884cd6f8abd49d127bcf3f9114ef5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAEZ2073034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe691575719274abd49f8a5c463c7362f631b966b5bde0ef721cac8c8f164c8f6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCAFF2043912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b506ec409ab0b6ff26519e58d307516e02a8d1ceb2da80ef0f06366a0786e5. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/TCAFO2121639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23519dd83bf9bc266e5605c4517f6686a4d89bb1c1a5c4821e13a4749a591b0. 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/TCAGC2200437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d704104d5a5f1e41791f562143ffa4764903e238ef5960d973dcab5178950eb. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCAGF2297414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78746ba9bf3ba2112d465570f0d94c543624e77c72d55766193134812b80fbb. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAHA2323560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00fcd6d932758c00641d5b839248d5af5aa82da9a43fae2c9cbadc993a1a43c. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWV2345340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55db792d0d10bfbc8bf849e521ef25bff9a5bff7ee520fa23b3016b1ce821b08. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/TCAHX2467891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc869cf40ea82dc248d794a4807ad99b166659fb5d4a21825e62f4040e5a6b9a8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAJY2534812.