A77 or A-77 may refer to: Roads A77 motorway (France) A77 motorway (Netherlands) A77 road (Scotland) Autovía A-77, a Spanish motorway Studer-Revox A77, a 1967 model of audio tape recorder manufa
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 0x6979c32ba2c06bdd39519ef785b92fa9b251ae8b3848dfcc6e301177059f6b2b. 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/bd67d3d7-85b4-4d94-afc6-9c21c6e9c040.json and https://artists.proofprofile.net/proofs/artist/bd67d3d7-85b4-4d94-afc6-9c21c6e9c040.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 0x4724b4d9c7e103e98d64a9c53b19f363d49a1e97cd871842aa445816da1facec. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZZ7X2421111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x967c1915b6de8daf5827def98ee3e8cf15c93105e30e75d29fc76781a2ab8dbf. 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/QZZ7X2419250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4e964f12b9d1f4bde07b73c1348ff76c9e01ca8bebf50b34016a225e6a43a1. 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/QZZ7X2419251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8457f29f7612469b4ab110bd928b43d037fbbe2516ff5fefc2a34ec0cb07e6. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QT3EX2401793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465d052f4542ddfd779290d6277fb5a3dd12dcb390097db00d6f2dbe48a94aa9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EX2401796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3937c616e80cc1198d174c971246af3aca31ed0dd47e646abfc923bfe6d0e1. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QT3EX2401797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acd6c20cc258ec8e69a2fb514f34139443ee878722fd4227ee321f9c0c5a483. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3EX2492975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e733eb2aa3f30ef7f752e8503e7ef87948a23bd616a3629372db17030f950dd. 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/QZFYX2560333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf269ba7e7ef63d1d78486ef03ca9b70c3693cd8f1ac164f2011f13f7d8b24f8. 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/QZK6F2589032.