right|thumbnail|alt=Light-brown leather bag next to man typing on laptop|Leather satchel A satchel is a bag with a strap, traditionally used for carrying books.Satchel, The Cambridge Dictionary. Retr
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 0x01b8363ab8aa679702063d665b7543e03f4d6587ffea43814be3d423931296e1. 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/1f9346d6-64d4-49f3-b56e-7b3be1ef4559.json and https://artists.proofprofile.net/proofs/artist/1f9346d6-64d4-49f3-b56e-7b3be1ef4559.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 0x53e037375d10ef05240af320cfb49cebfdc374ca5da0460d07afc4997050f5f8. 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/QZHN71906324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbf47fb893361ed568e004cbbf48361669857419b80cd30512fd063e32b0deb. 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/QZHN71906325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd216b9d9294bc8a905b46256aff92097e1835292bf0f8b2790d8d92621d1b644. 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/QZHN71906326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80154e38a5f3d1d0a047bcc9319e6dc8151e8870da443db91b69b7b3bb1fbb97. 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/QZHN71906327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5b3b0e6787786c59c6de33710bf08a5fdb9b0add58608115369ae5a4c25748. 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/QZHN71906329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3bfe1035336fa13bdc235237afe9dcc81bb8685d4e90b2d9fb55df6f1b9ece. 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/QZHN71906330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f8174ca9706ad0e541e888b7616f6563a5d394edfe62b3f1b396b8fffa73e0. 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/USSM10022158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ef8a86d41d56bf9ddb1c29a3d45bb721fac1d334ee92397397661c6cd13b8b. 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/USSM10020995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b81f6bb97a84530a7df4af2f71eedb10475bbd401bee18876426a725f63a716. 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/USSM10024769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6bdf45f6f10768ba0665fd545b2fcacf73b22957488a78d5c3480b8fbf752d. 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/USSM10022151.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7095ad557f9be36e346e55a0bd98f9cb11f76f05c8057bd882cac293609ddda9. 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/US57M1708615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd4d940e380f2b541eb2e3b8651035b857c402c4cb828ff6805bd66c00ae0d8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USZTV1100062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3769cf3b0616cec187fa2786c1a0f56347ec685951350d6ed8093e7e331fb4. 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/USSM19501061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e8b3c995b7f3f1b4899f16fb89842d45f3bd5cb0e40f818120e239a645bc92. 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/USSM19501062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c98bbbd990f3339fe8d428b119b906dfaf4609df877d1d2143b1dca4f905489. 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/USSM19501063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd01f51ff88850c2dbbfe3c2a9d8a985f06d49f4e4e7388df2c51af9956743e. 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/USSM19501064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8969a07980975188dca8cf1db28356544757d0c5a1770d065808f253214cc71. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBQCP1400030.