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 0x14e91036ccbb830a782688985492dd43c51cc5be019036f3b247333333fb0c83. 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/9096188c-4caa-44c6-998c-2d176dd7d217.json and https://artists.proofprofile.net/proofs/artist/9096188c-4caa-44c6-998c-2d176dd7d217.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 0xf1edf8bc00dc5bd366ce3e5245ba57d2a9f20a03ed21284ea0697a7a7424c663. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZNWQ2253643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e81537a9659d57339b1e3b490a4327bd696467969da757a785654e34c2b8d86. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTAT2277136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bb9fdce03f20c4d10a1039e304965ad04c98b6673fe60debc1a5e47a9e0de3. 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/QZPLS2376561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e640d23b2510772a25ba316fe592b976c6450ca70fe85420b552ae2a0a43f44. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZRP52388171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1287aa56b6677a684af9c7b84a990f81f2e971e41d512252e7508bbbd89af71d. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTAT2386390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01eb5527ac656abfb4096fd966e3d58e1171f7949c914e606dde8d0d6c455481. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTAW2302792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60484e11c78ddf5957e49a815c406d6c8474bf0d6def73d9d914026706c42d24. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZTAY2358223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d15dd12c5b00fa5896c7b2888b2d76142ff48e7db5e24d7b174a2a98b689d5. 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/QZHNC2485384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29828661dab3f44ea19bf506587e3d7c909ea166a049002fc290cad8cdc035bc. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QZNWQ2415572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd024f72828623e5ff80cf9bf3a8cc9a331efc276770327451f946225c68e3f. 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/QZTAT2497598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7501da97b883a10027dade85c498d45b3cffbea9aba8e95ebf34b9708a36e3. 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/QZZ7U2464124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0f89fc60c8ac7826b73a921d89cb083432fce7df5b92fde75a7568f364e43e. 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/QZK6Q2513790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628d5e314d1b603e2b96a374767dc25833b7ea40f36d15c1fe8cc46abcf57473. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZPLR2536104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2774155a9c867a64c4d3bb0f68783206b61123554e8e144438c9652f8ce2c62b. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/QZTAU2594172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc3a482642ad3343760fe625b9c77e7d17c186b320962616a60f17bd2e6ee072. 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/QZZ7K2526856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84224d39e483111f1ddfafb16dd497495a8f1019803ac6b09f5c4c0ae1043b62. 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/QT3F32591703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee404a335130d7a8953439c1768c846264b208b2fa3041653c4c8f10d6e6400. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QT3FB2593771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66d93f94093abdc8315ae019e47aeb2f0d7bb308d0f663319903d802cc7193e4. 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/QZK6K2498704.