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 0x939c625aae424b3b74faa54daa31ea7b29a8cb95c8978e66eda17924647f331d. 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/3ff2ebb6-f3a1-4640-8318-27aacaa2f48a.json and https://artists.proofprofile.net/proofs/artist/3ff2ebb6-f3a1-4640-8318-27aacaa2f48a.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 0x865b5f2dcb19d66b6eec83652d4f2b3421dc8d52cac7f0182cecb1c2eaec5bca. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/QZTB42352689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ba8f75195f6813fd785fc37f6125dc5e7942bb9a1c2b11aa432ef2e6c87525. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTB42352690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ba8f75195f6813fd785fc37f6125dc5e7942bb9a1c2b11aa432ef2e6c87525. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZTB42352690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a1850b711325ca89e19862cdb3c4545b527ca6af427e663ce6a549b2aa58e06. 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/QZTB42352693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf298aab554536f6f7be50368a6de2de85158e1b06f4a916de6ace10e0c0dde. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZTB82391250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11aabaedd0b596225d78d609e480bf708399f91f0463c6694c3fe9cebd6d735. 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/QZES82423063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73d8b510162661793b22c5c9975e3c98f20ecf3f5dc989ab9ee29e343219446. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/QZWFJ2468954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702b2d93fab9bc89aeb498c27c01effd60e1d5fe8c01f7e4524e4d59a6955616. 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/QZWFJ2468955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff60a1f45e735280bfc4efbbe4f8f802ba530ef258ab39d07cf9c688927f9e8f. 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/QZWFJ2468956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58be290d89d95c7ba271beccfb36651a247a12c522a84ce49fe2e6fda9f2e73. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFJ2468957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790f56f94860932f17382c33ce991021b583f2858f6ef6b0250ef33cf1f3f727. 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/QZWFJ2468958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc353832afffe10156b2e9e446382a61c525f572718e27735a6d54fb07d2ab500. 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/QZWFJ2468959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ebdc4839eea9c04f6599647a6565530098561596fbe688870a3f2f7b596981. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZWFJ2468960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f83f2738349d19599d80e860e981348e4c79320e15308b60de4a9a5a9280312. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZWFJ2468961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc1068cc62d842d2018136f8997c0954e00b607960dc5bff2d491033461d8b5. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZWFJ2468965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f3125d49c9832ba77ee2db5902c7eb25487f74ed0c4ad46aed8e19d458120c5. 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/QZWFJ2468967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0eb859fe4d63ea6165109c5eac6e727ad788a94fa72af8c6085fdfdd4a6c3a. 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/QZWFM2466989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e62d01b897dec58f2d62cd9b6a84e0f785b0d4a6222655e23638b87dd0dc3ff. 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/QZWFX2445367.