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 0x8d8986d7630c1da270ec8fd80a5331ba2520f35e376d01e2b81ab8de4c4e344a. 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/1381d0b3-001b-427f-90fb-5ea05ee77992.json and https://artists.proofprofile.net/proofs/artist/1381d0b3-001b-427f-90fb-5ea05ee77992.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 0xc6f4e1da808f750b45073db4a7e3a8ae95a9a01b500a2f1c5a0444aa45e14efb. 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/QZTRX2363556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d030cd79de0caada3d26423107e96eb015a723fc48cf3785f13330b87ba17f. 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/ES75E2301787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0aa240240269e20b6bfd982aecabf93c771956a8991684414e035bfc1d08608. 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/ES75E2300626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739b075401db7f485705d47e0e570cafb0554b4cbd9700bbd62c383de573b9b0. 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/ES75E2402730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b499862b73a45b1e3b83c7eb83f70bf427ac2d6cc6303746dbcb7602b247645. 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/QZW9L2316170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74187eeee0cda384052b6dc26279824259408d5d2af410bdff614c2c2da133d. 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/QZYFZ2388967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2eeaa945dcbb140d55eccad74c9eaf0a32dbbf0f272e14db5a2853f153d7df. 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/GBWUL2368511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8402326a34b7def30378530feb9e2516486023c8ab4b0677a4277a4f1791f58. 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/ES75E2306629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d1efa5dcccbaf89181615ba55b53e8c15d50c1f5a57cd3fe1a3ab070344de4. 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/QZNW72205620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e9da248e582bc6e9e3cdcdaf3f09122098ae4ba81b8fe758594e16acbaafe2. 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/ESA012242511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa331b9e9e1e22ef28d48e263912dbeebb29fce77b7732386d2a5acbc0cdf5842. 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/QZZ662329854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84b40958ae4a3d3f822d18d3c5e57f0d3af90d4b048a414c9bb9205db2479b1. 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/QZZ662329855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0d37337f174f381860e9ccd95f6a231230575613282cff1b4f361894d6071a. 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/QZZ662329856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0da67c21abe1618f8504cb60a9fe31cd54dee659c0d8e0788b82f7c77994f70. 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/QZZ662329857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5341f35bf914b75185779bbd7fb9a87579ee642ce985b5010e98074c6a6148a. 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/QZZ662329858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca25d30e2d8a67964f5ee8e53b972a2402a60e14b8a8a85b431e357bd08ed35b. 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/QZZ662329859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdcecdd9df509a0480b5d01ba6b1b7dfda2491b4077e38e79821ed07c796f64. 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/QZZ662329860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea3d3ea3594d808220373a91c64aa26d72bac06c001c07909d83804b2cc7a32. 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/QZZ662329861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c01b3dfc0757e765bbcc8dc8c993c73f625399f02ab1bd27eb2f5fea74fafc9. 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/QZZ662329862.