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 0x0721de4ab6e9f42682c17c9e21e6ccd77998b47d08fc6a03bcfd30b6117ec8ba. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/289f646e-e4bf-4453-83cf-9d71f4773a08.json and https://artists.proofprofile.net/proofs/artist/289f646e-e4bf-4453-83cf-9d71f4773a08.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 0xd5093e1b0e49c2d35dbf1d1203fe4a38f12f1009558e4ad15278d308a9ebfe97. 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/QZK6G2453350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15b4809fe3a6864e0eb10d080f75e7d2b3232fecf187baf2b134eb5927fc4175. 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/QZK6K2478001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72b8546bef6b1589421611b4b35fba6edd7e11e017c741566bc08d34a8580a8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZK6G2453351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56270caa4e5cb25007898c499efb18bfb0456b6703b21f70cbd1cc0350cec100. 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/QZK6G2453352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef4f9eb70557b47f61c2079ff389228f050c7453da0bf99e67a314d0380b600. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZK6G2453353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b1354c6e1faca2740a96f03de78d82c7260796919892f460e21dbed70ac13f. 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/QZZ7R2496636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f1ff31d5b482ee57bfaa18a260db28b8abde746b654d89dd4fd25dee3c24b. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ7Q2495444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a913d93c2532a7cc6f821e994a45d5a4817fee9cf8e011c4fe58038d13b95f3. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ7R2480447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2f93c3ccf7e2bcf199c82ef4465c5bd1c4344e419dd370fb4a8ae14de61eb0. 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/QZFYX2568363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc9a70a9787cd4692437d5e4cf33b1e5e14dc0d6d5d6fac79d98b335962e6375. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFYX2568364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b1354c6e1faca2740a96f03de78d82c7260796919892f460e21dbed70ac13f. 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/QZZ7R2496636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f1ff31d5b482ee57bfaa18a260db28b8abde746b654d89dd4fd25dee3c24b. 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/QZZ7Q2495444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcd9b7bd356ef18f2dee91ae280141bc47305dab6d15acf8fdc371827d1f645. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZFYX2568365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320c015398ec0c174f30d8e4bc153a0a351ea6e14f2608846811a119df29de1f. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFYX2568366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0da0d02f94efc238f6170bc0d3bf6e7db66d74c4264554f7ebe4703082bdcfc. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFYX2568367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a913d93c2532a7cc6f821e994a45d5a4817fee9cf8e011c4fe58038d13b95f3. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZZ7R2480447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76860aaa82406678ab57f5b42bf29e9bdbb7063bff66e3a81529eaf44d73f581. 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/QZFYX2568368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a4835e2fa4c9e25ab1ce3d17b35f8e4fbc77a04cfc876ff0cc73d6e48cf462. 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/QZFYX2568369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c32298b2b1662fd7c39d50a322df7b3a8165289615975af88d10182a981b786. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHNA2544244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d0a9fd2f97cc8df3987ed833c5344d301b4cf7529bfdad14828f3e133eb23a. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZK6M2554554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bf9fb91da53bfe2698873eb8b691494640369913f4dd9a4574f453e14e1710. 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/QZK6K2594577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d54f23529ae601cc7916a8b0811736d7f66f14f6aa84f1b043fe3f6aa353f58. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZK6K2592866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0101e5bef491d400c65e2371ba66b80cc1e99dbca91201bd9f6894b04a0d391. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZWFJ2576464.