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 0xfcd7d736b70e413489b9a16222527a62972231545cd502747c9166e23f4f1a10. 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/7acbf1c4-1b38-4ae0-84c8-eb3275628211.json and https://artists.proofprofile.net/proofs/artist/7acbf1c4-1b38-4ae0-84c8-eb3275628211.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 0x8eaacb0645a06a0a9fc7bd9ac730f8253cad19c42207a66fe5cd36724268ea28. 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/QZPJ32226751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae851e48f83baa1343d9a1901e4e4399be89b5203eb97c0583c381052761b8a. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/FR10S2267547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b69e75f8064304af893f388bed9013586c58dd9abac274d2632f0301aa7d43. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/FRX202249117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274a761893a2178ee8271c8fdd43fc887726209f99ef1af1ec1e2fb55df6c648. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/SGB502225292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6122c3f9793d850d0d71e2a06273bfa2e2579a4884e09fc2103a72e4a461e8a0. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GX5MY2236444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2a0dce5b3ef62f5c5aeaf79c1be12ac110913033072e59e396d22c03971412f. 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/GX5MY2290621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043c8986e1403cb6c3eff64d8f017c0b904e24370bdf33186d86dac146ca162f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZPJ32205920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4334ebf2688c9e75766b60c4f38abe0595aa8ead5becb18be0f4eb4bc5227095. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/QZPJ32226752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3efc37b70d9c31e404d8bc0d187543dc8a378dcdc81946c24a2b33bdecb9fb4. 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/QZPJ32226753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc91030c1e4317d84870a2ed91f29d03193e1573f7ed38e8f5891dbe44ec5a6b. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GX8LE2368021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aacaa5e058b4bb137a1dcb34bfb834607ef5a1b28f538a5ac2fe3b5e55f154. 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/GX8LE2391619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf33a6d5963e314d7eeb48c2c8dd808cbf6685e7a9453a2f4b0ddd55dbbfcd618. 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/GX8LE2369325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d08e29ffd2e35de69b2640cf63019674538a45e411a237ae38ae70df00e554. 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/GXBDS2334502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170ef49eb50dfb49703699b2644a692032321c81542800db7652be96dfc727fb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/GX8LD2411953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8b883a37609428f4bde773641fa2453ae1d34deddccfac70f10e98a0dfe53e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/GX5MX2413941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc798a2bf8e60b6aa507b8d2d1ea957b5ba76c7b7fa443308462adbb1356aa6ee. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/GXBDT2468904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8d640ee73a09c4600ef4b1b79c8154995b5f36aa25f77f7b87764c5d10b8c6. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/GX8LD2532146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x516006675a4140336c13b46f2b58611ead7e7dfada138b0de710c5a534b993f5. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/GX8KD2582517.