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 0xb8baac0133436b86da44817edcd3a0f05038ed9d0d88b80a1a944115e2d0289f. 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/ba1c6bf8-1f67-4cb4-b803-5f79dcfeb1c2.json and https://artists.proofprofile.net/proofs/artist/ba1c6bf8-1f67-4cb4-b803-5f79dcfeb1c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xf1d1bb79389f4c715be5cabfa7a2984a0518a522362d71723dd7b490e9b6349b. 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/CLKT21902139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79f22874482e68bbee94cb7aa99dcc11f471012a6f1a3bb5fd83603ba603377. 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/CLKT21902140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffa135f468b0ddc27b2dfaa0fad16f2a2a09af661be965cfa957820d45fee9d. 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/CLKT21902141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a047ac00d2a8283da65bd87173b8d4f2f1e6bb81b2e62022cca192cba79e57. 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/CLKT21902137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c491ae4732e5fa1d155eefcff2a0224876ff88986d1a47b4044b7bf96e53bd. 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/CLKT21902138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73e86c64291f057b928a6d03bb814cc959ded65c23193656fb9de5ba81f0e7e. 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/CLKT21902142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc38440c910ec96b932c589fa5977034a4715e70f855c3bdfa0d931903a92d99. 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/ES71G1868088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28952222de2400f6b067dbc4bed8bde456e80c24a0b067912a3bc001bb275fd. 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/ES71G1868089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941cfab6c7545b293c1e4e7a618a8a2486651d5529e39595c2c0b832d6a03d35. 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/ES71G1868091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1769d55f31c125209f3692a7d31278c5e3933e3ec67bbe001d8762e0616cd348. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G1868092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2d2c920ef2b81189df74160ee7a30b6dd4aa267f829d3cb144da4e397659a1. 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/ES71G1868094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c34d681a87e2a4522f4960ef8e2b3191c26519fa2603955224a47d79b5badd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G1868095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1eb47f52f1f0d4e6109e57353df5fd6c554ac623f8e0b00b242e32714a7b39. 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/ES71G1868096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab3feb3a38cfe93c58e8c4465d664642deca27f8ffd1293c7b63a116e830a9ce. 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/ES71G1868097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fe511b26cde4d3ada2801ae4f8c3d63b418eee45ea6369747f654ced2f5c4b. 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/ES71G2415305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d27eca6ad61b9dc9ddb1665e7c8898cd8bce34f0f7794b4a2c53b14f07805a. 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/ES71G2418111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a91ed05a674e19a5339cc1d493abe133f494f4b995746fba4f82e778644cc26. 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/ES71G2418112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976d6256ec5db96fca7f75bc5644ac213e8ba192a99173d59569533d963c9651. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G2418113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fe511b26cde4d3ada2801ae4f8c3d63b418eee45ea6369747f654ced2f5c4b. 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/ES71G2415305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08734e2cb6e5d6ef7061c3ca1a6813ad8ad519f83ac2b82968ccf9247abebb54. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G1762098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51eaf8c152236edd17325f448bbc29add83271de316a96c9f0f4fe0d3d3b6b2a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G1762096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083bec259b5a9d0b77b6ce1f799ad0eb50f27409885ad5919a64e5c3eba8ef01. 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/ES71G1762097.