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 0xc6446bf84af94f82f56b44bd7597d31b11e362105a2f3a5004a91631852f8515. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/63e1e6a2-74ce-4561-a461-04c3966b2800.json and https://artists.proofprofile.net/proofs/artist/63e1e6a2-74ce-4561-a461-04c3966b2800.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 0x12aabd130d35893c02c0901f48115123a614dfebf10ae505230fe685bd274ab9. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZNWX2236560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90020c286445643540b0127b0af7f543703d3850af6ead4c1783206c668eb80e. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZNWW2259965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c2d2708defcce8ce137767fe1b4a1d141c64deef369f74c8e2cba7acad51b1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZFZ22363155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc49882f7862ee0916c3f51a703ee785bfd50218e249885d92acf4724b312c5f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHN32362719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc6383af8d6de5037f995267fab5f2b6f3ca07c82b2e252a7e7fefd666727ef. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/QZMEM2397863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8c215f2d763605912d095238974bea7d6edb9c90bb783cafbdc4343819e7ed. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USA2P2362632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96d202639d101cd47503d2cef3a4594b88d4c5e4cfcee786bc313e99d1dfe97a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USA2P2362613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8825a1cfea089fa53cc7b1d9bf35080eaecca8ab56530b1d61820f063ea43c52. 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/USA2P2362619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa406af24fe704547526f5735e0e9a33f40cb88528e79d389ce6837ec21344467. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAX2307034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c2d2708defcce8ce137767fe1b4a1d141c64deef369f74c8e2cba7acad51b1. 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/QZFZ22363155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90020c286445643540b0127b0af7f543703d3850af6ead4c1783206c668eb80e. 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/QZNWW2259965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12aabd130d35893c02c0901f48115123a614dfebf10ae505230fe685bd274ab9. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNWX2236560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc49882f7862ee0916c3f51a703ee785bfd50218e249885d92acf4724b312c5f. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZHN32362719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41ec79c35dcdb777e344a2b4dc40c771104d3c4e01fb6908e626c55979bf387. 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/QZNWW2247023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cce67555aae087e30292718448ee7bc6d46af0c14965e95d900043c0a4084ba. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USA2P2362690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8c215f2d763605912d095238974bea7d6edb9c90bb783cafbdc4343819e7ed. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/USA2P2362632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38344950038e8230591fba1a8516985517e4db94f7348b97ab1cb2d576b801d4. 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/USA2P2503485.