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 0x5eeaabb70e6267591fadc3bafd2d8b77e92c4b74ad25e89f4037213137178cbc. 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/8576febe-614e-48d6-800b-11c74d08edc3.json and https://artists.proofprofile.net/proofs/artist/8576febe-614e-48d6-800b-11c74d08edc3.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 0xce7b4f10e49b7201c94eacb96b4ab4534d8f93b62eb155e32ea341cb7677bb78. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/IL4630800273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef51b4be67ddead1e738ed34fcd42eb9b20061367736ac950108ff338d08771d. 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/IL4630800274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ac67454211bd7198ac97e3aa397db52fbc1eab88664c54af7c11b8c8f40aac. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/IL4630800275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c789520236ce96ee1ca60e0c07cbfe32820b2087faa5d11cb2f21f43d6ebfa8. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/IL4630800276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7f41ff653c06eb826cef9c7a1af962aae3cfe61281957a289f30d2424d14b5. 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/IL4630800277.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2526c1609d4ef976ecf60c5b19d34670187ccf6a4ff7f95d234217566d3f8151. 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/IL4630800278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b8cf4343e90257b7490d7a5c927bcfd6ab3d6396e23bb47d5cff726524423d. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/IL4630800279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86946f846cbf3fd72d56c0c1883dd55635e5450e2601dc5f76ecf4461bdb916b. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/IL4630800280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f30083a4e52e5f5e414876d93980faebd2e8064653eff17822ce1502d65af4. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/IL4630800281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd463eace8f4070b16aaf1b11eb142364307d01f40816c415fa4b73bffebfb52. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/IL4630800282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7b95b6429d846ee4af0198e71fc7f873cd8c673039a61240ac39fea307ef65. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/IL4630800283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63d07db27a88c4f2634bc189178dacb5caf62d55517ca97247ce9547ca4cec8. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/IL4630800284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x831c1db11fe55e25042175104247184df34d27b11ec1bdbcdf2fb7b04ca7cba0. 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/IL4630800286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2526c1609d4ef976ecf60c5b19d34670187ccf6a4ff7f95d234217566d3f8151. 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/IL4630800278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b8cf4343e90257b7490d7a5c927bcfd6ab3d6396e23bb47d5cff726524423d. 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/IL4630800279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86946f846cbf3fd72d56c0c1883dd55635e5450e2601dc5f76ecf4461bdb916b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/IL4630800280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7b95b6429d846ee4af0198e71fc7f873cd8c673039a61240ac39fea307ef65. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/IL4630800283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30af9fe5c0c5f0db9b0efa4ec76803ee2ec0cdc7ef98666325202735964215d. 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/IL4630800285.