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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fcf4ce6231c30de44dc4f8858739af17fc1986de9202aeb7d9c1ce284eee95. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c85863b9-d759-4923-bbcd-639f18c508c0.json and https://artists.proofprofile.net/proofs/artist/c85863b9-d759-4923-bbcd-639f18c508c0.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x339d134d801437d01b4d239529f5d87ea6a251680e5ff833fe3c667468b5e5ae. 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/NLKK11300011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e3ef8d4b17e0de5da2aad19d999947c295d193fe95a66245db582f252a2281. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BGA471607119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496d3b807689e5b2d74d3fa33a5efb7ce9700be1aadb775370924f32896642ab. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/BGA471701104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f74084cb8ed969b52dc608de3e53d53e0e33190eb58976fa7dbb4b9d9ad6112. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/NLW7B1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68d162c3884a5c296dbe4afa0cdf48d42358e616e9321a7ee540711c47bfdd0. 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/NLG662200265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7137cf84917f7ea7070178fb295d0dcba310c501870c9c4b3eff559a19041d. 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/NLG662200275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33272154bc261fb972b7633b3cff927b7f0c6636e0a68eb26a9dc0a150928866. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZK6L2253169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29018a6a8f6b321a7f2e51db9b67575df708564a20e63d1a5e4395b762d4a522. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLG661800629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4322f7887d114dd734304ad79487f084ca8eecb75d835ede78e772d5669f10c8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLD321000097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ac611f3095f4f9be98b1570841a354c8a92359bfb011fb348583729b231506. 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/NLKK11500161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66bbc199c32c145f49f4fc3a577acdeb4b07fdf5529440f60a6f4acfedb8b71c. 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/TCADC1700043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4191dd57d0e00958a82bd3283fc0321743fd68b9ad8dd6c40c4e3429fef7e6f6. 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/NLG662100612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90c147c046d8600d0e282527f13a941607be735b550bed66c79c54a04483d84. 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/NLG662100613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95209a46bc73747edb8162e5ee4e6a374a8f7d6f405d7d49e0f005d046f4eac4. 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/NLG662100579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc711c283dd21dd840af123de6fb45a59ffbef8472044f847bd49a6e3a58dac. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG662100614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64278fa7111257342513f2bd859c5d738c2c8e2870b057d4d83ad950fadbc72b. 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/NLG662100615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cc0b7312b11d74c1e3cf3e028870459dde9620446f37136dc0fe93a125ae5a2. 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/NLG662100616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bf39ce73644fe12cac7ead9c80691283237f32de5b9ea00e2c5924f50a0f8c. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG662100617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4837b798aa767f9190757d768bb9313d6caef564867d35f5d4f54abd093aad90. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG662100504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28161488c32f58f2e8d21abfd239011c8bc2a9682b52a342216260abca470338. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG662100618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012b17c5902874ba3d50eafb7175e1d6c7c20eb76a3fbbef19002e540e0f9085. 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/NLG662100619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb219ef4c499ad816f6837a9c2082130002e607922bdcbfe44f6ec7398fe01c. 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/NLG662100620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a67e4df4166d0038c28e4d483f422492dd192b422c1fbd114ee3ba2314c4955. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/TCADJ1779244.
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