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 0xe906ef993b110d5d42ee049864caa848cc372b6598d2d5cbc035cf00c0b42f47. 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/f4c459d1-bfaa-4cb8-a866-8b449769a5ca.json and https://artists.proofprofile.net/proofs/artist/f4c459d1-bfaa-4cb8-a866-8b449769a5ca.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 0x6e3690dbb09e00db34ef57b0a76db46177c39e908a7e87d175791c39be0fad90. Chain 2 (Bitcoin): anchored in block 959011 (2026-07-21T16:10:54Z), 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/CNZ681900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba80c3fa11d39ce6f640bf0ee4628ea1f0751dc577849dda327e3e89712b0e0. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TWCC31803379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7131d00235f6073fccca5a0f7a3db12704b08d93236b4b7e0e376da5cd02828b. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/TWCC31803396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53999d53018f69f9c59b25d4848c3e55f39f237fe3efdf5c89cd710ad3c255d6. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:46:51Z), 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/CNZ681900086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x108f6519a3fa9fbb88d6ecb45c56e1bab3d501acbf738e88af94bc5265230420. 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/CNZ681900200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6871f6cd9d5104b8ead5fec8a4a592361d063955a5b935269c2bcdb899ad4e1. 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/CNZ681900198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd10dec601160d9acdbf9a845f777b5c1450d3658881571bc9d381896205b617. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/CNZ681900203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb681cbc33d4dc76285cf1fe38d7f37157369ed6a6fd3240a56555ab2952cbc11. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/CNZ681900202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c70c8931c738247a3ccb1cf288c7d7e336f042400ffa08161261e7abee13537. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CNZ681900048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b47395cb4485b2ddb4d2fbfd82b44f58cf58f45d158fb566c0c75fe7d6200a7. 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/CNZ681900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1aa4ebb792b584e3bb8ec3cb1aefb01b18623b8c5c6ca59017d5599b8227d03. 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/CNZ682000225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc0ed73cb01e6e8191a67b14df664a15de1f39f52770ae3bca389651d32fd90. 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/TWL252107101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e88f4744253a832fe150c4f5e6edfe553f4b7851e41259bbf2f2a917a9290e. 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/TWCC31900141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2298586bd8152adb96241512a9a6bdf57c2631a11efca2291c62ffae1f0cde7. 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/TWA532100606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff4d169dc25f4917efb5b4799930a0e0ee8fe63599a0bf772d4e8643dd7cb07. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWCC32311475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4842038829a3dca6b806aa7248527624b69e59d82f0192dadfe9ea805498a8ff. 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/TWCC32311476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e836655a6dbb1b29a02b8211d12b63545f257caca742cef2c192b81e4b5b00f. 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/TWA532200393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbdb3dbe0b170bf8b35febe6309d6c6b2794e6f686d3909d1a284780f8f380e. 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/TWCC32004516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0740a62efa85c6b7c96859921cec43eed8ae74a37d28185f5e559c3206f5a52f. 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/TWA532400009.