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 0x95e89447186e83c5f16be5134735788a6b2c6e2c9b17fcd00821763ea1e57ab0. 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/a6ccc47d-c788-4402-b4e4-f553a3cb9df9.json and https://artists.proofprofile.net/proofs/artist/a6ccc47d-c788-4402-b4e4-f553a3cb9df9.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 0x193320118df73c1a7b3bb23058f86be90e4ff7d49690375f2266d89210ecd2b1. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZGLM2405171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b51ab935188de589c79afb13fc7d115728604f2fe849e1ea4dd441b4aca721d. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZGLM2405172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b39c850fabebc2a5abbea136284d94ceccf0391ddf36564b7a61a29e707df01. 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/QZGLM2405173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fee132b30d276b9841939b706e04fe3850c1d17ce574f42682c3d1c6662f2b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZGLM2405174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461967228f31b592082ae2a398bff29402d3254833a3f94be8ba6a4502f1d660. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZGLM2405175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43197f89a345b392b143b5f5fd2f8cb0d26ed7a38bd2586ba1879d5ffd2b32f4. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZGLM2405176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93529d460c86f9f80f9b4fa01d3820cd6cab9425b03ce9deb1a0e42ee96be9eb. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QZGLM2405177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722804edf85dfcd75e177ce646ba366130d15ce83be3292f6e4798cc15794230. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/UKXN22432670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa5a383afc0fdf459fd2af0cd301261fdc623c968519c27bc3d30105e2a47c6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZHN72490259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca5dde324ad879c27ef3655bc689b9e91aeee9818c592848946789f88686537. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BK4DA2318947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa346858c1e53b999c527c6ef484c9e818c5fd3487eff7d71475ffe7c404ff15. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZHZ42261625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe854fe8d81dfa82be15358fc96ed850c77104e8e2dc747c7320ebdae2008cc06. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BK4DA2323999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8853d9e1613d94b4abddb080deb8a392037e534eaef456f9a909079f6eadbc0f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5543e82eae78aacd46a4f54ded2d3138048c17e98f998f3f3698aab1c2dceb01. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cccb3609d9f36cc215112c6b417879c2efa27da8f68b82d9ae338be7f8d560d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47fa15f8321892f3ed80215191cd30e442d0ba40297487246d5b525c04b3fdf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QM4TW2524560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4bfa23c305f47d53b2175b581a91b5efc85092eb9cf55dd6915ba9845b679e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4916a14b8481f8fd69914e8258c9e3b8be57e1d387107a34fa4bd8cb733302e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4753302baf35dae06510056f1f9196b432d02cd9b4fb1d1744106a5a7016f02. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ba856a68c5e2143689847229cd1a995b48c043d301ff6399de265e038b5488. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW2524314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc217450a08574ad3defe8a8f34d8094ea57f96a47eac9975f25bf86a989d5c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2524621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c19cc58bd173f868b517f198279ab3eb94a542c33bcc920daa1b43446ea8e2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2524495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x602f6c0b46c2a1f1ee82bb1a5f959ccb93af955e2d37eb7f17003df2c0886238. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2524626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ca688b97407083496ae15df418957723efc5f18f5f6d465edbf6fa81805645. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QM4TW2524635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85bf02e88c70fb2bbb6cba2ca024afd59ebfbd697aba8818da353f7af9781b7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN62406075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1b269a8af470f4b64d60b686e4cc241f849f4f3a090ce28051334f0d1b2745. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GX3Q92512284.