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 0x3d50b3a39bf2254d66e4a2bee9f1676ba543c7b3e1cbf71927cbb8d5fc7901d1. 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/e7e3c826-09a1-4be2-b3b4-06f5c24093a9.json and https://artists.proofprofile.net/proofs/artist/e7e3c826-09a1-4be2-b3b4-06f5c24093a9.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 0xa9230b106e0e62fb3c13d1725e5eeab03093f3a48d4055f2bfc809aeb950052b. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZFZ42334324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e17fa21e1a33de11d200ff79bdffa68ab1d8787488c5a4b811c8bebb03435e. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZDA42362338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09cdbbcf097a3337c9a627712905db684d9eb333dd2f6b47a37ef40f642462e. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/UKZGC2303764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23c1ab272af72fc4ffd4112d13664e95229bab1f05e5bc3334216ec9ed03033. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWQ2342419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40a0f325b73c231717686a83a6ddd89f54109821f5b0dd264c7026e5f145d1e. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZNWW2364092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5930240aab20378e6775893f66d2087a132d79c4cc039e54bc236b237cf1b705. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZWFJ2368190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c1d0c352eff27e46119ccc1ed735427614347e0ad59a1e88a46c3137b71295. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZWFR2329618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae46f82de3ca93a14056a503f01c6fea59221321abbe10b58e0e23dd589e7e0. 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/US3DF2489267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0daa9a905784b2612c952a4131f49a0e128ac9215552d3fd837facbce764bd. 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/QZFZ72445611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd91f49497a9c5b58cb8edc8f46fcf0e4c2f09ef78945c4daed87303e9011e9fc. 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/QZES82463898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900a74bbf5e6545c65e32dddf30e729da878a0f26e17a0ff8b5400df3c181ee9. 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/SE5752446729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa653faa0afb2901cb17c7ce7ed67f8981bd81ffcd52c5da924c83956fe14be8. 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/SE5752446730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18ddc9d07aba5bd69fa93b90381a58d991ffeb2ab64f162c2447370cf671eac. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/US3DF2449153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1c202ef92c25b832353bc4875b6a7b57b1e98c267a9ec530bebb046158964e. 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/US3DF2449145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c520cb7d1f383100b85e8632f8865301f72fa4dc2c30093e8a5d2dd227e62b7. 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/SE5752484535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3f2430fafd7ee06c5e940e5f1008b4043646797a9256a9642e9a3b80e93b50. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/SE6HN2456778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec29f0e703b7e3d3860dbbebbd62568dbe0dd0d8027ce570dcb1c1569e460e10. 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/SE5BU2599018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19c4fb8818312507a551920ec7cf74de9d5d84c24224a1375f9ffe251f45ecf. 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/QZZ8A2559599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c79d6e78a06fed8ab9ecfaf2a26f07600788f432e42810bc3af937568f4c372. 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/QZFZ42490818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4914ea40b0e5fd19826bc751eec3275fc54a69aac07d0fa08f2176988a15489. 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/QZZEB2469002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5350f56850e2de496693b208cc406dd6017b95564b0aa340445aff524ef63aa. 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/TCAHX2499136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4914ea40b0e5fd19826bc751eec3275fc54a69aac07d0fa08f2176988a15489. 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/QZZEB2469002.