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 0x2e4f717a36776e340592dec7a53235fd797ffd3c15d8d51c275bc6b068091ec8. 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/f993b496-9df7-4d09-afdd-9359def9959c.json and https://artists.proofprofile.net/proofs/artist/f993b496-9df7-4d09-afdd-9359def9959c.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 0x10dc9b52c0d977fac0c3b592e79fd9f8db3bb04907048644391abcf3cb0774be. 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/QZFZ22029643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d850320c145d909585092c33c3db99159c3deec9fbec3fbb99189b90fc6236. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFZ22029644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80970386fa8d55abfa428493f2ea26d328a7d7db25619f8b65c4cd4548efa79. 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/QZFZ22029645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbdc1fa177d0caa52da2bca8a6c4cf804633fb4cc88e5e6aad41e096f528911. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZFZ22029647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e681142a1ebdf9e34a3f5583f54ea4da1515d06b3555b13e711afd32a313278. 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/QZFZ22029648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152d40480da5f9515fa03c9e1d0a6e736b7813f2ed77881739aa8f2fee7686a0. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZFZ22029649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c25c7b407c3489c6de922f0f238d491d87a4c67f04a7cb088b7a6812a8491c2. 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/QZFZ22029650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28e7a6a7db1d3c3a743d5f997fd3c39c6e1b4d56761caac34149cdca94dd829b. 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/QZK6G2291832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa277c04e85d23f34942a0ddf0b950b1691abaf44be19db114ebf5f520ae6295c. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZFZ62395359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5446ac7a8e023cdc7c5cdf55a0f1669b428c20855f935cdd10bb8002cf4345ca. 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/QZFZ62395362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876b724d4a7d3a0dcdefc1e6b5697611a52575fda5dd0863ce3d7bf9fd09d1cb. 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/QZFZ62395367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83d138f6d9a25eab761e8406264fc4487a71558f9d5c162d155c5ec79325d603. 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/QZNWR2312599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2923fa5a8da545a99b1540082c61cdc924f740381ae6cf4e0ddc58cc21f6da8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTAZ2473293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d50d054da177d15d6c3e487e1b7cdf424ddb06766c17427f6fa11ad39950c8. 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/QZTAZ2473299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe46f520baa1b2006dbcd98577777c1176c5c018127228e92af49537687037dac. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZWFU2521063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cdf599ac98d0058c18802cd8bb71085a6600a565f87de4b26328ead0dbeeed. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZWFX2548272.