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 0xedcc5323f1ea1fccca2348221e0ffca013a28244360cc993d2335f0d1718902e. 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/b8833a24-a42c-4d54-b30e-96a0fbbe0bbe.json and https://artists.proofprofile.net/proofs/artist/b8833a24-a42c-4d54-b30e-96a0fbbe0bbe.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 0x3746a4695e417fda6109bd263548d3544956ffc9cbd0dc2035b72982c44fd353. Chain 2 (Bitcoin): anchored in block 957703 (2026-07-12T12:26:40Z), 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/TCJPC2425709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5ebdda7a9ff7398c66a57592409e97c6e2421cc9fb364c735094da200fb8ba. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCJPD2553043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e31f19189487ca3159fbd1be6b088c40026dd875efe1137558a885fc0060706. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCJPF2537889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b83fae6c79bebaeac6ca116653c9324fc4691e7845effe173cd7ea2cae89b3. 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/TCJPG2593374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47ad37c3c014d89409245aa1252fa0fb912b26848edbb71b0003f37ed586c06. 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/QT66K2534805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda5115ebd7682f51ea0589c8587a3fd13166e1594956cb1f9a6065d04086412. 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/QT66K2534806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3df6aedff8e346d5946579f7e9c4c149f1b13104fd5f00f7df8f2a15d189e9. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QT66K2534808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab96b273e04866f169deec2db8d733e7d61e1d5f40c08fe05f2df6fbee6041a2. 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/QT66K2534809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ef2345aac5077b6c9cad69dc37dea450295f77233f36173112c008550dfdd1. 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/QT66K2534812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054465f6e26cd0dcd6faa1f0dca3c3e8689ada28971d2587164564a654870148. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QT66K2534815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a1444ab59602013b92bb6eb0d7c2cc82b37c3f9c1d229e3023b9ba52a31667. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QT66K2534816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47ad37c3c014d89409245aa1252fa0fb912b26848edbb71b0003f37ed586c06. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT66K2534805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda5115ebd7682f51ea0589c8587a3fd13166e1594956cb1f9a6065d04086412. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QT66K2534806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f3df6aedff8e346d5946579f7e9c4c149f1b13104fd5f00f7df8f2a15d189e9. 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/QT66K2534808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab96b273e04866f169deec2db8d733e7d61e1d5f40c08fe05f2df6fbee6041a2. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QT66K2534809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03a1444ab59602013b92bb6eb0d7c2cc82b37c3f9c1d229e3023b9ba52a31667. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QT66K2534816.