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 0x45caadee3e007bbf1d7a1617c6bb1e02826cfd1f906af9f6b1f74749312670ad. 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/2df03a71-2be8-456f-83ff-1368187618c9.json and https://artists.proofprofile.net/proofs/artist/2df03a71-2be8-456f-83ff-1368187618c9.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 0xf06fe345e33417460a165b53ce1eeab5cb849e17b05d6f5895f3632ee6801b73. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZNWQ2152857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1a08a9fb99a2cf800b9f0146e11ce10bcefb29f8092170ff11cd4947a208d7. 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/QZES52243913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3c8aa1522a326d396d2eb4fa454937cd7c78601a479e2d00c43c96a60dc330. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZHN82249995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3c8aa1522a326d396d2eb4fa454937cd7c78601a479e2d00c43c96a60dc330. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZHN82249995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a45a3dfb7fea5e66b7a17e46d101ff736c13f0c7e63d3991bcf08c939f24ac. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN92254837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a45a3dfb7fea5e66b7a17e46d101ff736c13f0c7e63d3991bcf08c939f24ac. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZHN92254837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0821464600ce6bf2e18de95e13b7727516fa27a9789d5caecc54239984e53a2c. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZTAT2244167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1683c6d887ce0f2e195b5b2dd77189c7ae84cbacb40272640b6252285e817b4. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZFYX2354182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c6f4c424bff2d1504458f52707c222a685fd99cfaf1cc39bd2759204e545db. 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/QZK6K2360289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a461a6f1a37554f5cc2446ef40535c9830dc612631945ec949e6fb51634f62d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZK6G2302017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa05ef0427cb580898f6af71ec8bbb3c3c6e1ab57dbd299fb4decfbf9c3be9c1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZFZ42427701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028467233e01aa075f13670ba7dcbb74f4624971ea692b7bac58198c4ac97a4c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNB2418363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x028467233e01aa075f13670ba7dcbb74f4624971ea692b7bac58198c4ac97a4c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHNB2418363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c154405b7774b7fad7572c553a08b00d85f4f2507f01d2d9a9d2997f84591e6. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZNWW2459772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf9140a09cf245e6a0b07b56b2a1a1eee41388540e257b491f54f83f9f22e3a. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/IEWGI2508030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf9140a09cf245e6a0b07b56b2a1a1eee41388540e257b491f54f83f9f22e3a. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/IEWGI2508030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d46cccda5f137f417f5558b2100d2d590fc72e036095ecc67efd4ba8f1e7174. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZK6H2355623.