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 0x6252835e1b37742949da0d7a7876d9db295fce2b043f7c7ff86510c6572bd709. 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/09e5e69f-1e75-4855-ad53-e02f56107cb2.json and https://artists.proofprofile.net/proofs/artist/09e5e69f-1e75-4855-ad53-e02f56107cb2.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 0xcdb25d62b753c00ca3bc2589b40dc137413c01923f21d57bc6e632055c41931b. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/PESM21711366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1d18b2d8530700826348397205ab9b6277317291e99c7bb75c42b84bb4ef1c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PEMR71811131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39166e80805f955df63b3c62a40bd6ce07619755bd92810a78a1d3abfe17900. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PEMR71811135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fcbaed00bb1e1e582d79c438c3d22cd50ba6221ad16a6505015d941672c9b0. 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/ES71G2149425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa33b7ae8503c7a9bc8a8e5d706aae569bfa612be3d438d4ac6b0c9059a5371. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6N22227263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1666bddb7ab415a3bee3dc4d2c818f73ed229ef5617a9765889cb5f3f5bdcab9. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T03:34:51Z), 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/QMFMF2330715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93373f4904d3b01d05e2876527591052fccbd8bdc2969c65579fbae21adba67f. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/ES71G2305882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c70a6fdb11f06d9ceef4a4a9140c22885c8782c8d564fe6a397752a8686bb3. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QMFMF2333530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4151311ec60be304b4567f3fa5d335757d4f41f08d597b3a43085d95e2ec45ce. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QMFMF2333535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50676c42a9ed80480d5175a6929495040a280b8f32cec254e97632ed43ea8eda. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QMFMF2333544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2659041f2be3ae851675d7066fc03698d8636924d06db55bc7581ab59816bb. 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/QMFMF2333548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4136556d6f305c597244a5fea276059a34e7a926e7727ea3f130d6e054afd0a. 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/ES71G2239930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1c9de5ff2606f0968e08a657bc6a067a8e8041a39f94bfcd85c8e5602f029a. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/ES71G2328022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31004b827e3de847308fee9b2ed1855c8b18c313dbc2af028977b2ee1c2f3df. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM4TW2467727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfedd35b9ea1c09187294457d83b33c4af073ac78e131493044c9830ba30cac7. 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/QM6MZ2401104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe946727fa897a508177a66321a60e280f1845ed9c03b5ac0f24dcd507a333c4f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6N22480120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3208b81f8ae14e481c58eda8d3c09dd093941424e3f53136354269913d30fb5. 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/QMDA72473194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085e77510194697b53b32ea0e101877bf5927d571b125ead5bea40e82943ace1. 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/QM4TX2514025.