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 0xa39b92dd218852797ce1c37b9c65675a5f084f0d8a9577569d70186866b01234. 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/6627234f-f686-404e-a305-37a031567afa.json and https://artists.proofprofile.net/proofs/artist/6627234f-f686-404e-a305-37a031567afa.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 0x682c44c9a79f9145e04bdcec33ea29da9a5dd7d4f902017d11b1f1f0d8b6805b. 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/TCAGE2220700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cfa667a2c455d7aa8fa2b618aa9cc6c66e7f367daced867b5d872a23233c2f3. 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/TCAGA2269348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519c13aec34c70ebc37eef9647ac1017e378c5e97df93c34bd05b250bc9d0c61. 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/TCAGA2231071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f72d97ab14e9b510dacfc1560364fc390f4dec0178c49531a1310fb4a15351. 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/TCAFQ2164142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2e44cfbcdf34697d88e611d6df46a98d2962f3404e0016154a09784da3160d. 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/TCAFQ2164183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ff15b2a6357ebefcb652a5243389d5703d681c912e3a39cd91d7958947fd48. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCAFQ2164235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96c8de802791e3267082ce7139ecaba091668965740b427fe794e00799906f1. 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/TCAFS2196185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9bfca9fa17fc28a5ccb87fe8727fa256e5a8596991bc9d27a72122765170c6. 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/TCAFS2183311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7b5242c0460e03372f822f0e8182f8119826d89937f49790aaaf25ffc2d206. 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/TCAFS2183242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c56c8e04dd830245fcb7286316f6fcd61a64018960111af7d83493e3e7d9be. 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/TCAFQ2187352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2011a65975b7830be6197a45faef120a9b50fecc32efcd062bfd18aaa48bc00. 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/TCAFP2171610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99fc056747d505930d9d8cb6edd16bf62d637d74021e753276c412466d549ef9. 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/TCAFK2160963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8151123126f28014da87be82d35d517c275d78b5ba33a150fbd65e60b019b29a. 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/TCAFK2160483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c8e0aeff3e7099c2ae9dc0696690f8fd2f43a81d1975886b5a6b72ed743bf5. 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/TCAFK2160989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb73a1a221a64361a927af6a790cf87f4ebe967417ca9a2fec2fa1b4c0f70846. 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/TCAFD2069296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5099554fc0f7652e6eee593bf3fa9ec24037e2b684b6b2f046b6edb618991f. 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/TCAFD2069040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5a3c9c173f43b782bb80c43b89daf4192ea8c97f615db2abcc981023dacdc8. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/TCAET2073140.