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 0xdc56cf1c75f5e3aae7fd974afc84ce3e1020d187b69f26ff91579ff3dd708b1b. 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/100a0760-b4c6-458d-b1a2-17a12b3082a8.json and https://artists.proofprofile.net/proofs/artist/100a0760-b4c6-458d-b1a2-17a12b3082a8.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 0xb773d1560b19eb81b6ae47e5143dd47013119a289da73a448c44b6613ca374ce. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEC730000071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c00cb4e257c40eaf54f44b182bd6df8e9d4c413e74f149ac0a885d8d2f8158. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEC719400666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b9232d88a1fee103bc071422f570968c5f548aeece263e87ed9ef3de1ad39b. 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/DEE250700042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1b47130bf9c05efa73ab5c720b91c83d0635e05eb2c6f3846c63ea5af07ac8. 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/DEE250700051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f8d29b4687bc927b104e148529b6de2f9935a06a0731373d336b4c72ab00f4. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DEC730000062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a732d2ab0dfafe6e3293a6807a4fbd4b25555100fc52d4abe02af38580ed4ab. 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/DEC719400352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e4b4f3d297231bdbdb67b657ef83eddcf592382a5bf0cdeb29926f741e35ea. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEC739400445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ebf08172290e4428a4c3e9108be3499c8bd083aa9fefda552c58c2c55b13c1. 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/DEC719400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28461418e9bb4550f50cec2e50535ee0b0844f8cff94c5d8f48b4fc069974922. 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/DEC730000073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00d085e1006ed41be4fcbc938921e93fc18b5e9ac0ff7444a669a403c4162f2. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEC689700250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ab6716db4fe20626a6cd829c9977e3bd0165353086b14e7a524fb09ffec40e. 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/DEC730000072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0fad2a89927bca6798c6bc6bc32df8c34954d31039be4cf313b67b8ea90307. 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/DEC719400665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d735c87246f2504c831aef2d648223a5fd18c83bbd48c2723a5b8fc4e5ca9ee. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEC719400354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab227e7a992cb35cd27e9cae158e30e94e92e6dabfcd72ae18fa802726d1f2db. 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/DEC730000075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb773d1560b19eb81b6ae47e5143dd47013119a289da73a448c44b6613ca374ce. 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/DEC730000071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a732d2ab0dfafe6e3293a6807a4fbd4b25555100fc52d4abe02af38580ed4ab. 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/DEC719400352.