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 0x54361e1945c7d176c538a305510ea9e7069b20b06b813ac48b38fb0dbb0e6f49. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2312b1bf-2bbf-44ff-9446-9b1be53f709a.json and https://artists.proofprofile.net/proofs/artist/2312b1bf-2bbf-44ff-9446-9b1be53f709a.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 0x8456815d8c62f209aef07d1c1e3dcaae724a18bc237f39481e7d7395a607f68e. 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/NOZ7F1604001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2330c0d83113dee1db0ba8fb356e81f72fa2742877f74a10a30d1cff17a4b08. 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/NOZ7F1604002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb563ce3eca83896001811e4159a2cc2c428b5077ea88d1b2cf3f9e5b4523123d. 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/NOZ7F1604003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5a8481f3fc38098942bd8d80dbf022b58c7bf8514f8e07df3b1c7860c9a0ba. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/NOZ7F1604004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bb47a051b2034ab409c24d1d31a4a83e5bb01f2a9b25b6be781077d38da615. 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/NOZ7F1604005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb621d83575fd2d2b9643590b555a007bdc2b7dd2c26e87ba8704d890fec061b7. 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/NOZ7F1604006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825d827094bb38edbb76ae9192fed3fce66d06dfbc3b09dfd77047467d005f55. 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/NOZ7F1604007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d488ee67d38f0789940ec1be8a3b722d88a93f244de53ce458d4112a03e4d3b. 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/NOZ7F1604008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab7b62c2ea89e63239870817d14494baa685bbc976fe81408242d397371165f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NOZ7F1604009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ee24ec2f8c8968db7d51a79640245eebfdb95aa15944ec7c676c408bc54700. 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/NOZ7F1604010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6f2e058c2962c60a0752a8aa3b3008bcd2da328a9ef60f69d2d393b6cfbc7c. 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/NOZ7F1604011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215642aa0d8c6b43f9f4a90c53c3aab98459818ad3c0f7a23247c89af1bb51bc. 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/NOZ7F1604012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe332d74139a68d6dd0228e97c1711f48e6b745e309ea4b01e83e265b04de61cf. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/NOZ7F1604013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773a021d10315253b7b397fd9f9d01a9e824a02a0bbbe0f83eca1ae9ee2728be. 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/NOZ7F1604014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84174ef81b73de2b23a65f6dc845ee7abe7034d42c83da83778782086494b94a. 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/NOZ7F1604015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40848c8f1dc17e51776f0e4dd283a095fe18043b3ed7533cd8d96c50301af4da. 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/NOZ7F1604016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237185035e9c6e87161f924604b221ae10f9f05694b86e8a270214ce37fa430a. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/NOZ7F1604017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878e1ce51b45144602738aaed230194ee87cd30c66e9dbf3d090e57c7fabd0a0. 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/NOZ7F1604018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd367013040d3f50dab58499cd322dd768a59cc33f1ae2fd26d64ae4c588ff27a. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/NOZ7F1604019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e39f9b4a4ecb7d774a7b6d26e2f1d1dc6abd922c0bc3b41fe736f7106b0e4b4. 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/NOZ7F1604020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fca3000501fcb8f0d171f4c833327499525d27904ed83e2c954a42f99efa8f8. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/NOZ7F1604022.