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 0xd45ce085384844a16ef22e7dbf7dcb5b8bd30797301de4bd8968b88980b695a3. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6232e3d-7978-4808-9fab-fe8f00099773.json and https://artists.proofprofile.net/proofs/artist/e6232e3d-7978-4808-9fab-fe8f00099773.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 0xcfe4d820d8e6677f6159339ef12358bb233cfb3367e1f3f8bc9253f31076b62c. 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/TCAJZ2574674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fa8e9127b8fadad5e0041e1ee2704cb15e633e42916d5d0d5cc9b04b5749d5. 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/TCAJY2574690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d0368b87590cc6a93b1a2c2407d993023971b00b23e682ad8c6cb1eab6ee1d. 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/TCAJY2574697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd497e2661b7397642409a67b8c47d4e2302674b366e50e48c20dca458146e04d. 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/TCAJY2574705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f571da78534522a2aae9c5bd718b99fc2f6a9128ba6779d9b91896696ae648e. 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/TCAJY2574720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb04374e4c7df4f838c2224ffe2f1e33d592af437062c657bfe3dac0b62b0697. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAJY2574724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6176131b4f78bc410fc0fb6088722f29efc52c739b38f48e49394d68ebb6392f. 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/TCAJY2574728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17cfd65c4577541e114923577f54cefabfb71cd99aab735027f3939a4aa8e80. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TCAJY2574729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062937e902d7f16d66a3009892b125c07d8d879cfc0579eec5dd56e2ff0a5e4d. 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/TCAJY2574731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbce2301c0cb656aeb26b192f6076975b2119b2372f5bfaa77b18bfb3e50b327. 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/TCAJY2574738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ec11471056c537a9425b35d04bd5264c7df9527eb8750b660062526ecac949. 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/TCAJY2574749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa0925a540977e5e7249c0a692b43d9d4684d8c846c4d8fe215382eaf74a710. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/TCAJY2574753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a643fed49975ab022766e0f984a26dac27f9d726dd3c960815096fb62c9c1c6. 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/TCAJY2574767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae44483967fc54340d06034fecabd692011c4cb577b3c0d5bb9b2eeea2b4af3. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/TCAJY2574774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab9ca629089a95edf04d2ed72c7b65c8f3359600295681f01ae56debf72643a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCAJY2574783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7828ea633d062182413742067092f31cd4a3a4eadc2e8fc790aabc50a3dd96. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/TCAJY2574784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1f10322b90ad9c1c67681a0dfe7603af71f54631f44751d6f564762f0c7703. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/TCAJY2574790.