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 0x7061cf063cf541ef1d509bd30c976b46a9b834c17434752126c181ebd8c186f6. 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/292b809e-e4ac-4afb-bbbd-0ff6584b6a5d.json and https://artists.proofprofile.net/proofs/artist/292b809e-e4ac-4afb-bbbd-0ff6584b6a5d.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 0x4941295ec2a50ac74472d02bf1c37f7a86f1770d7c7f52a569c6977835af2a1c. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/USJ3V2376839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a86a18b7372b88322083e6243bdfc135610ec86d8b04d9d050f67863d3a8c8c. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/USJ3V2376844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7318ce7bf2a34f8be9acf4db28985ae1328f834e2bc4f16893fff72e7633e9. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USJ3V2376846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08698c0bd8ac602582ba244f50a8f0d82dfe37306775993606bd3c1f6f4ddbff. 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/USJ3V2376853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d402321b78f6a95891ab1da2bc396d523b86a772e70768f6ed6be5facbdc359. 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/USJ3V2376854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6e373ddecedc81ccf2a24ffc3528bb56fa2ab97c2af689ae8e6fbbfd5f7dd9. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USJ3V2376855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32432f7a1324cffade864d9a79a623ea01863a973bd3596401c1d2d2c4eddece. 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/USJ3V2376857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef49802953771e0aa90f66cd5db586dba44c9acd7c03400127e053dc32c61fe. 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/USJ3V2376858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37fbaf614c756ed5dfd1cc6c5273ec068adc48f0a0a052c307fa5f3a4ed4123f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USJ3V2376867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac0b2539cd76f95243fd278a52e08e975e01cd7d0a4af4e0ff6b51b6a4fa877. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/USJ3V2376869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e8c61878eda1c9d12029658c6c61f5940ee62e07c0d907d75bce7ffbd32a3c. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/USJ3V2376873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3739805222255cc9ed1f2a28f074a18eb7f6df1193a5c9b68703123c7813f059. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/USJ3V2376874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b7533d81abc112ac024ca35d2843e39614835273d2b8c9f38401754c0c35ad. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GX53U2039347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ca0120653e8273b7305bed8c1e52c455f15c74f83b072f37d76ace7ae64a2d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/GX53U2039349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dc5fc2784330379b75c60c2d241ff8b85972a613dd86ba95c55909622cc08a. 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/GX53U2039357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5c90cd8d2af07c08b1cbc880ca44149c1f023440980df89589a3f0e62ad100. 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/QZNW72289927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dc624b640bc032094a38ab9271eed28714e2e27a54e011787cbd63fda1dda6. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZNW72285366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22b1de0eb2298aea35cd99d91f9e85a6f73e0671c90c7f5d408f7047fa34ff00. 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/QZTRX2200924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2623a7b1c0e5cd86a65e7ae2e448c6f8acbe29bcbeb65f652cdefd9e891ba88. 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/NL7WM2300953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0326fe4a9d379aaf0b4275c480e4b2016b9711799a6dcba6694a660d74243dad. 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/USJ3V2376892.