thumb|Rubem Dantas in Madrid, Spain in 2017. Rubem Dantas (born Salvador, Bahia, 1954) is a Brazilian jazz fusion percussionist. He is noted for his work with Camarón de la Isla, Paco de Lucía, Ramó
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 0x7f22a03d35b30fbc5ee801cd31eeaf18100ff3653332ebd81ee72becc4f0d2b1. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1b34c0b-90a0-47d1-a56a-c72cbd0c74b7.json and https://artists.proofprofile.net/proofs/artist/b1b34c0b-90a0-47d1-a56a-c72cbd0c74b7.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 0xda961c34894243b0f70ad70a12a9b67dcbbf7e6baf64be2a6238c6cfbefa63a1. 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/ES7730005340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee3465c5d6ce1636e1bab7b74443b8e3c57ab685db151e3e7000f1eabf7956f9. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ES7730005352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06277ab73a4892384001354f32372fc448ac2756f32755ed3cf27f3f82b1c1c. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/ES7730005345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07111a6102c149e8a64f92f6ae630a7960cb14b3b511c4da8ab813ae0a64fc97. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ES7730005339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e5b20ca1ac1bc5fab0cb83eeb77f3ceee4ca54b0ee64a77dbaa70410275e1a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ES7730005341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac4b47029dc58180b82cba5555884c13ac38adacdee6da05a92e87164780677. 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/ES7730005351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf6414bf65b74fcef495e5a481767a9e70b332805244c10bd478ddc7b2e12a8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ES71G2204905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfb97eb9f4e3eaf6b32b19034ddb287639ab642fe45030b79341d8c27854b9b. 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/ES71G2204906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca20ba0d945c543f910f04ec53b54cc2047817bb67849a46884f737dcefe21a. 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/ES71G2204907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f8ec692d342a2817f3c8698f480cf169b8e52c2c75cce80214721067208f7de. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ES71G2204908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9872703eabcda6724df7ef5b19f3d60d628cb6698025810bee3f192ac2a05b5a. 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/ES71G2204909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e14f7b2e7c1e4db06b19417ce3f30ac0e26719c8cc98486c8e168e9be90fbc1. 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/ES71G2204910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c62f0aec49ffb530a97b027c69d749a77775f950e32311cdf8b81d9d4bcd2f. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ES71G2204911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62915d5ed819412fa4986287eefd4aa41290975b554b5edd792171854855d940. 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/ES71G2204912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192ee05e927918b13bec50ac09047d2260a80896a1418eed43cb503a5786566c. 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/ES71G2204913.