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 0xde3ef5bd61640ed681d9aead8793a63a6244ccd66e046368af133ba87dcb3f69. 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/04972c9e-ef58-4fb0-9ac7-789399cfe3b3.json and https://artists.proofprofile.net/proofs/artist/04972c9e-ef58-4fb0-9ac7-789399cfe3b3.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 0x9c13c53b0213c965e353b2d94149b20e04f8d7f00ae00f9b62146417f44e93e9. 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/QZRP42334007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eef7258234f129c97b6c84d5b0547e80117f7a0ac6260cb1ccfc665288e5276. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QZHN32414674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc262bc7fe733e9babe5d145b17577329f0d5bfea415fc598462ac766244a0759. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZWFP2515749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160304bfd2144b2d53e44524c78a1942ad6b70f607aa34d32f6657851683c6d2. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZHN92484378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c0fa037a8cdd170eccf9acece4370d55e30d7acd9d87008f22d9af88a1ecac. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/QZWFQ2448505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d1d73fd961b8a0c7a6bf068e3935814b2131b552809994f2767d333e57079f. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZTAW2328467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5747a9897a89ae520df1652334afd5ed7ce1101d09f2999361a1b48b83723a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZWFW2549046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6956421d88477742897f7107ff2e7920db74ad0da4cd95a139c308c5de756b37. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZHN62445880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dd756a82c8bdd0c8cf938e90c5b7c268717ccf4738054b40303c194b703c64. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN42446213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda5ebcc4c01a095077ddde3fe831be25a98ac41c33756e2dee9b02fee839af1. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZWFE2569334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103c4d79885c2ce639d3767897730c908403cdc5dfb8f2d9faf5d1ad209c0bf1. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZDA82319989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298349a276d7f7b7c9db7a0db315721e20a8ac30a71dd636604cb7524bfe7753. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6Q2217685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0336e8385fc5d25d487cd352bc3df4be40e068e5342b6e18864a2923c1d077b. 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/QZES62467141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe039cd05bbd1db14ab53dae7b79d7083349f88fb7b7de349013862c0bcb2de3b. 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/QZWFG2583768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac3fd17fc7d9a54c3191344a330342263ea734eea917e5f632282863592cf95. 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/QZZ7S2541002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417364b14772c632f43c6ae21bd94b0b350e4e9ea45ac2e883940b810feafc1a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHN92404314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d06517e129f0df5977985f334d2d6d8f381da46f2016f123b35c5bcda6beba. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZDA41959517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec85423a93199d73864a6c11ea6051e498364eac4e7cd4e7c35c748dd322b86. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZDA41959516.