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 0x06fb64be4f8bce4fc6c11d6f849293fed7399f12475048c243f1ea6ed0914cb5. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f1f0fa3-df09-417b-9b99-42bc6af9dfab.json and https://artists.proofprofile.net/proofs/artist/9f1f0fa3-df09-417b-9b99-42bc6af9dfab.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 0x7c7ba6a5949be5aeae8d934b308ad28aa61b4b867be74e97bf27af379885ad26. 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/DKABA1001326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c738e70311bbc2fc8b9e967655da237ebee3f5eb25831f4d3cf812934420a36. 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/DKABA1001327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390cbdbc63f5586b0bc4ab01fdca9886b529bbbce6900f96b3af863aaa7f65e7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc405ffe5d1532c73de4b9643962561dbabe8f6205d1d4de1a710fe56275f6e38. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81aef244d978d35950d9b00dac84ede1d97fb27975a38044c7063ffd45731ebe. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf2338a8aaa2ee8879f4ec5086d24c58a5c31961815d1efe1fbdb1e81da85ee. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6184c172637b34cd4841e550e2917acf2e4c256fd892d50e6870ca4de81de3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c15fc007aee3ed35d26f484b3c93242fd786cf2a993e8223f1e44ddd3287cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b0a63f2c2cc28834a78d018735edde22bad392ec97ce0744c94daeb53f44c3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:11:54Z), 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/DKABA1001338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f4e9ff339416f26bbe1ea9812e8a529fa062c3ecaa5d967e75ad4f62c6d657. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:03:51Z), 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/DKABA1001342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359a9dd46f4583b61626a1a951e9f458103909f86777e5066fe3ff459d35c7a3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67c3bd82e96f89f610dc2bc8a7e4decd0a779d49e9134d98680bd76570574aa. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f0d17550266c376477bce1032d547e0773230b461014558e4b9823efe23e6d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd820e37ddcea9f3eab7b819a3a15e494faa84480fb61487768ff8887be4d7a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKABA1001347.
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