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 0x87719d4f9116d3fdd992849bfdcbf2009d1e2657ff61dacb9ca65fc4b0180d9e. 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/d007f344-bba1-4005-ac0d-86f5102cfa0f.json and https://artists.proofprofile.net/proofs/artist/d007f344-bba1-4005-ac0d-86f5102cfa0f.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 0xbb0986c33f5aacf5be834fb7bf225089055facd68d0705bc8938e620938f0e57. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/HKG732457444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892f50936828aee9b1e30edf7adbdca91b135d4fddc5cf350e9faa78b5d5fd13. 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/QZZ972332324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x785f5b996195d7b042cd32b1e4b63122fd30a3466ab572055aba54cbc27bd77f. 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/HKG731647306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93a5baeec896d23fde541a11871f967f3a0c762640a29eac2b4e7b58d695470. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/HKG731647307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e036f9c252d3cb5ca4bd6124d8a4dd50c073e09e5dac8d767e135e0f0cb55d3. 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/HKG731634215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d0f2c9063e2c50a5b0edcc0c72546d90d40d28a2e1c8d80156fc623e44720dc. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/HKG732387927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e22ca17271a71b770f9eaa8c9248c95356df8ce4b63f39d36b99db6d298f02d. 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/HKG732390479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0995a90c1dc49a2c1aad9045f409d8704b19b26d3fe5779a92f1bcc2f4daced2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732390480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71ff968502a0ff074a35299d8e0bd89cf4eb5a345f91f8ad3e78bcd569dde98. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKG732383962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4327b79d94aec676dbef269824b13e9dd255f557b462055b8aa517ef901ac78. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HKG732417166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd4748b55b005c6f83305a9ff66e5e04a660f528ae0dd47f84984924ef19c88. 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/HKG732267728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65c3489a9a4fd8732e32d73c3a9d23712be6365382664e38f57b0c893e4a8ecc. 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/CNZ632200556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ec5314c60c8989e03aede370c46a0f192f97752a049cf0456510ae46924151. 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/HKG731622533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc0f91f8b86c672bbaff00d57fc913fa1569acd6b491f18809f9c8501315932. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKG732156349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b44b55d9b069d66632fa07675f09976dd789b3abb4664f27de6673df530d00. 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/HKG732154062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1a3a77c56a95144e5b57cd144a3ddd5f52f14f7dedbf42b3b71f42ee863167. 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/HKG732154061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1641e27a87883a9e86f81c3be962ec3fe39bc28142559c22fe635a7e9628cf. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKG732132753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3dc0d606d682ed26963611b88202998e4f3d614cc9c93c766c9a2ba222a48b. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/HKG732040000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671f728572454e841b5b6e79f153b88988b25c27e33a85d8240b92353ea7f6da. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/HKG732154064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa535c1a0651c5c21e9c8781fa5d506f3db283ec293e79cd776decc0178a921db. 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/HKG732142806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a4a194502e63c162959bdc6a5738d98ab56cbbfa03b2572c8581ff4fdd8d08. 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/HKG732019628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f1bb8593f9d788aa5eff9887639b3783fe0ac52917b273f7ba59306c5e0677. 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/HKG732154060.