thumb|Raul de Souza in 2014 Raul de Souza (23 August 1934 -– 23 June 2021), also known as Raulzinho, was a Brazilian trombonist who recorded with Sérgio Mendes, Flora Purim, Airto Moreira, Milton Nasc
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 0x7b8529e0d1c195e84aad9e18b0b0a7028f49b09167b673916e61267ad8245ccf. 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/ac16f019-b2c1-46d1-957b-3f321f160732.json and https://artists.proofprofile.net/proofs/artist/ac16f019-b2c1-46d1-957b-3f321f160732.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 0x1569e802e5c6952ae3157f6b863ff4c933bd5a9bfd755ef5f93a26b607c67612. 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/USCA21001068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b85b6fd58c7c68e4f8663c3181652f06b843b6c39772f4940eb41e96ac104cb. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/BRPUI0800206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69fd441d1faec924ccdad1b93ea963dc0ecbc2ae31750e85edcd0f82cac77bb. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/FR0G01500520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79a07b8a46a08a08aad828ed2d83f22c60a0b2b1cd79260b8aed81576075182. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/FR0G01500521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5eb00877a0a1e54b66831628fc78c48a90ef2d606b03079a83cd3f5baf110a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR0G01500523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573a7a7f6fc9b549c2779df81dbaf0afb5f324e4acdf7d3d02d9af883d992784. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/ATZ062013702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f446091f63f17262cdce767005fb745b8fb663291e3438cf84c3512c1c5e82d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRGPA2200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aa91a528542ccf53a293c136c664b21f8302f98273ee2b30a9268e523a07360. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRGPA2200056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef841aa8a65cbff4a42f2ac2a64062cba9a44e3e8d615208ff5d7f822795ee1. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BRGPA2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42e911daabb382b7d1e0191eb0b434a5ade7309e53038917668c6c7f032e0d07. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRGPA2200062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x560cea626732a00c62ba143a6b13303d0df8ce0331d20d6f9ebea7663a39e54d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BRGPA2200061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5039405b0db4618e8e1dcf9f9bbb09fa2a61081a4a630f94083c45c43d646b5f. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRGPA2200060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5b34ad6c69b2fc6d9d9477dd3b68c97914db68e20072b8544bcc4699356864. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/BRGPA2200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e965a9f3497de50a76beb087279e991b4a0a0cf79612c2020f4674c928ac181. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BRGPA2200058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794ad8e4ae74328bbac1f71106df1355447cd72c3e56a12191276d74bf700a3a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/DEC821713005.