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 0x6db733dc7dc5df7d9bfda25c8e5eecc376d0200d66a668c4953dd9225696ca54. 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/e98252a3-88cc-4c4a-8fca-d7a8a0b70805.json and https://artists.proofprofile.net/proofs/artist/e98252a3-88cc-4c4a-8fca-d7a8a0b70805.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 0xff0f5fb400b3d9ef34bd526def24b88b9e861cf682353143c319917933fd61d2. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZWFP2354284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be877edb3d5ba370aa7c37e38024f3ad1dff1e3955055ad216afc3929f18291. 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/QZWFP2354288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4411dfc55b247948e9344633a60d83481ae8b8c2c78268eae8df65496f78e9. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZWFP2354292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3161c99924e5d4279a770ba0bdc3ef7d0f9549e6a6fae15e64a0f90a938de44. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZWFP2354295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83a2502c0e7b582fe7400da02ac18bd7b020d5ac946d99137d8230f1d20ff612. 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/QZWFP2354298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec0a9023e3335e966604eb5c56e1002cc99529e3ea32299a422347dcea6f57b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFYY2497631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89bbf1ae19fcd54086b83c3762799ea95868cfdf50b685221d69477a86ed092c. 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/QZNWT2485267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c203a04aed94c474aaf43f6447e8880ab02dcf1da3e1389c2ea79ccb33dd80. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZNWT2485272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ca4193cbf7171f6a172ff825f2eb7c43b50f67af0c5f56d5ffd568fd488b2c. 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/QZNWT2485273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e8901acabbf6378132e30f1016333a5a06d8913fd7c496bc6d74967e493c8a. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWV2463773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf46bcce3d5737b7699a459226cc622e8a8b91fa3df37b9ff46809baf6c579fa. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZNWV2463774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b81c55bae12b0f35ad79192719b5a3d6796db250056f609773f6daed02b79df. 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/QZNWV2463775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa246d884dbf27e2ec1b91bf50c27294f5aabe8ccbb9d065cb3884234ff1ad883. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWV2460293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601c907b606f69012554c348f49e665315e0faef65bcdcae5e92b5d0be771456. 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/QZNWV2460294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ac8c705aaf02c1a3ab85e1fd32b3b552a0f73ac0bdd6338811cd84cc26ba28. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZNWV2460295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf40e68c3037506d8b15db78d1e70558ef4d6a5e656d80b7850a3bb2317855e. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZNWV2460296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8716b68289b296f85c3bb12663734662547fb9d8ad41ab34e8489eac66a1f5b6. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/QZNWV2460298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d1d5e7368ba7095d3f0552b921a30e17058f382c58c204aca7c6fee306ca72. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZZ7U2410565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469cb6c1ba76649d90b8aebeb384f8f2a347362415519379d7a9eba263a68ba5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTAU2581155.