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 0x8286b1aa8c9af01aedc30abe868ae33e750f89469dea94ef9ec71d6b28b4f516. 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/6fcff827-9035-4a3a-81b7-962e6f3775d6.json and https://artists.proofprofile.net/proofs/artist/6fcff827-9035-4a3a-81b7-962e6f3775d6.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 0x09b8a5778ee67bd46131da60c8174dda2cd3e8a0051e37baa258e1ba2ee2975c. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/TCADY1831174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a2add1e5ae27b63c4d01e7f931202e2357062b8e7512ba19beec004e518318f. 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/TCADY1831176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0285f3cce7f73c60a2ae202ddbb5f03e222738db4a35c944a2cb55517b4181e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCADY1831178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f75146be753fee6bb20fc9ac83d62dc6ede9018ad526a88c782e1b0926215c4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TCADY1831181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90451089f2d5e6d05684701f132864c09a7d0c869f76de8bac284c2e6ca17a2. 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/TCADY1831185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dfbbc7d30bcd9aaccb26904903c54d2920121a531d8ff946536a8752b8f203a. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCADY1831186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b18d4c5f1a00b32a443eeb56d27fd23863a1795d8d6365b6bcb3c406a3cc21. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCADY1831191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65dc90518f871a8b2641d5668ac7c1035f5a5dddee25c498070bcc4feaa62338. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/TCADY1831192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197ce06084be49a02d3f115732b03e5a578adcde13be0c95a42300413e979ca4. 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/TCADY1831195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad58553d4265658c2ea7ff55df0ff7fb5a3b9749531b2002163b00c534c4c5b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCADY1831198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360c83cedcdb769b57531fdcf5d0c8476c9f9c825de5a8e0deb80b0b99fb245e. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCADY1831200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c5c1d795648306a2647ccf9366e1989334cffcb3c76c57bef9787e27cec77c. 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/TCADY1831201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdbc8eb248fd39f49c4adc7059a66d4e29e11f6f72106e2d557f9b3a7474373d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCADY1831203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2239960b23e8ed448ee176c22981b667364dfc6f51bd3ca833cfcf07ab40ccd6. 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/TCADY1831204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f2893f5252c4dda5ead2c449efaecc49066c40013e76c4cad8d8e8b57a9735. 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/DGA072384123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c9eb79f9b4fed97815a560d596b402994166dbd087636d3119597fec02becd. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCAEA1957796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad73faa78faf60a3762d6e2ada3fb47b03ae7de7ec715675d11d33ac683600b. 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/TCAEA1957799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d49fefe568c7c9eb45d9dd9112b0b1d4263b208022a34299aaab2540213728a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAEA1957803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b2bd9da1ac1ad3101159aec446e7efdcbbf9f461be33dc5979905961f9025f. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/TCAEA1957806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8955c6c9c497d6c266f77feac35e810af4f67b9caf05b9958a6b96292593cd0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCAEA1957809.