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 0xd9078f90a7b2141614727e527f6a07767674d6c27845357a8558c776c0d45316. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/321680e0-a144-444a-b4b7-fc3f662d708e.json and https://artists.proofprofile.net/proofs/artist/321680e0-a144-444a-b4b7-fc3f662d708e.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 0x8d780cc13fb10a737f60b0c765d8dcd17f0ed2d07b6a87b8165b1b11ae41f554. 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/QZZ7N2586194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350bed1c87fb402d23ece07ba0b71a8cc1a25c3564bf4c82153be92c3cce89d7. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZZ7N2586195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973a2defbb4e1e7f16043decd3e1e5f86372b3577ca0cb492d716e75a00fea68. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZZ7N2586196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a7f2cf0ee184850e62085b308b87c5855532e4b9879301b1d70228ce602057. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62def284c14b4ca95fbdff368de895e8c96c958ed64cd947e6531b0fa005dd4a. 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/QZZ7N2586198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ccbb22a6f19d4fca8f49238a5bb962338c14a02c852245a25dca34ce40fe399. 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/QZZ7N2586199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0a94583141d01528271a3f2afa754cb914f272660c1e35eadeb299cc198a73. 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/QZZ7N2586200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2059e8ba5b69455158dd4696cedba49e230966a6ce1abf5006a05e837b7497f4. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ7N2586201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59244a4cf89a8abd36959f8f30c566241c4a167e3a8fd55dd766005d2ecbdc48. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60951f4fbc8709343a517352f2422d5e75df44cb3d0266ce7064914d620d535. 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/QZZ7N2586203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6373cdae52ebcae56ddde1be6093ae0b165b33830eb2ba3001aaed4584b9375. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ffeb5057556f0ef1045e96dfc0dfe271d9d61796db8381f1634833a88483dcb. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ7N2586205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ee2765c702dfd20d055641c7d4952046aa9399436cd372b5c8c4ac86c22d3c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a6a33f76f20a1683a5756021888f998dc933021ed8ade0e9d1711cc6229a7cc. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZZ7N2586207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adbad1c804869dbf815f6e1f0b38c5c185c824f23d38039f34bc2aa63167151. 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/QZZ7N2586208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebc55255a49a7e8978817ac9dab561bcea3003c94a63ad525d5d17d19bde932. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4521141ff57418a10cd0e133235b83df5115fbca3052925b070a3e11bcfb2c30. 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/QZZ7N2586210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13203f9add5061bdc4b1611b7e5e06755f640002e4096922668e5c1b4ca449a. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZZ7N2586211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e59e71acc556b015fe97189088f6dc5f4d053e57ab1c3780bd729e8142056a. 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/QZZ7N2586212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc29462e1553a21cc22e21b7d4bebf351af9db88c862bad4c06fdb638d50c9684. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZZ7N2586213.