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 0xec451360b50fe8b1f6752f3fffa24d226836c5c9fe85a58edf0c238832c526aa. 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/9fd552f8-25f6-4762-b8d7-714bbf8dfae9.json and https://artists.proofprofile.net/proofs/artist/9fd552f8-25f6-4762-b8d7-714bbf8dfae9.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 0x1c06c99178be702a0d1fe5a3a9bd15b915ca8fbb87585408e5e1baee09e438bf. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USA370636174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968a6b4085978d017188ff7e89b6a94850f3de5ea4684ff9e81960dc7ddafbcb. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USA370636178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d736204908c68d51eb8d16ddb36ae8c2b4fbdc20c007eff7c04850a52429e57. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/USA370636179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7840d800dac16dac5e660b8c59e5b8aeda9326195e4146f642621bfc7d5a968. 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/USA370636181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0303c3339cf18acca94e3ccc77e4060abc2fee2e97453a38adff16880dca4c54. 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/USA370636183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa27337376055ff0a7d872c7c6bab4946522d0e73eaff8cf56c8a5adb1f09ab1. 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/USA370636187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c53208cf59c0471199419c34f7b337b4eea62bd73a3019ff8a766a0fe075de. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/ITG620800147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f674a0cf259fe671c7888b7c759395611aeaef3ae11cc005eede12e649faf1. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ITG620800151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5ab86c3bd03f2dfaf8e75792cac9cfd7de57416c9a0b84606e2a31459b6b8f. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/ITG620800153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517f4270e82661dbf3e592092d6c9a78b99ddbda7f4d504bc84e8e4b5e3b45bc. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/ITG620800166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd85d233692c1bac8fc9eb9ad955e3ce42f476f44bb0ef235abdf9b01bf5f9d4. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/ITA616606188.
Sul ponte di Bassano - I canti degli alpini
I grandi canti degli alpini: Adunata nazionale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x917dafcb7f65496a356009dbc570c0a1dd67e962f644c09b34efc33a35a9118f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/IT0681701758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcd4b5c32436cac715ad2b8e4897c4628b3215b951123899d928e9317f1d89b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/IT0681701779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f406f6c5867ec35d2592880114931b80d32f471b69e33ba79b45990e1235195. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/IT0681701780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad72273fa959b8cb42839d0c1c2bae7ad201996c1a2a5ced171bd8a9fef9f831. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/IT0681701805.