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 0xe98051757983ca40165ad5e7d0c6d33ab47d77de5b5021c68dca3ae8e7806ccf. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbb971d7-1d3a-4101-997f-6c9ea1279ec3.json and https://artists.proofprofile.net/proofs/artist/fbb971d7-1d3a-4101-997f-6c9ea1279ec3.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 0x2efc94544ce648d389380dceb7e537de4eaf0c027bd99510dbcddb41d4700138. 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/TWCC32121985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083afa4345b87ca3073c4603ddaea1d70aaf573658f7f6c6b8d1de7225af1bfb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWCC32121989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2b76c9fa070afc706fa33b30dca56bad443bef06c372970cc3aeab58f2826e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/TWAE32002001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb69a694d57f819b70bc8805ba052dcc72fc8f10a8a3dddf7e17fa32b20361011. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWAE31901350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd954b482bb26cab6d364f8df8e3aeb6d5a885558a39424c685e8c833f5615910. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TWAE31901355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1640f20153b3448581115eb3dac51be08224682f58f4601ce760df69b6ecc48. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWAE32402692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb803a65aec697a637574ab024242ebb52947ae812c7bb54c51f2fca0a61abe48. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/TWCC32121256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e0a41bad4fe3d774f878dfcd475fdc7ba24441f2a089723887a45bf004b3b8. 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/QZFZ22262762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a18bde02804d022b433be56cc8b27f4f1ffd18d68ae8a549176100ff6f0585b. 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/QZFZ22262763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e2581e7dc1d05af67b1b59f6c8b6af77d3f348b5e601d40fac74a77042bfb7. 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/QZFZ22262764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75db652c5bac06e75fe11c6380b4cb1256aacc076e98f18067e378d46e021af9. 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/QZFZ22262765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976f39e98121a19ca14e1c3daa3e2962466d7cf76394d01aa260fa5dddfb1775. 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/QZFZ22262766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb806d9a069dc366ae47c94b734ae6191cae339ef20de53d70cb52b11c77115e. 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/QZFZ22262768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d3b7c7473545a595e62b34d1e473a9362d656493236d22e2413bbc6ede95f30. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZFZ22262769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8d732cc3c987311264bdbd160ee75ddd6918bc4063840a77d084d3152f0483. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZFZ22262770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbafa73f463c213ee0b65f83b65bc8b9bba470345cb9e5168690fe384e5b0b777. 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/QZFZ22262771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa582375f9aeda845cc5a7c28b3f71997f26b7743b96fd1d07a0999f51387bb12. 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/QZFZ22262772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bfd38f5cbc50aed79f611e44af5d345c5a7c68c8bcea24e007f0c149eb553d8. 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/QZFZ22262774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17f4606fa0a1db6c6e7c122542083858280f2e5b630e2861105f906a09c8ce9. 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/QZFZ22262775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78917f5429690f53f679da76924e77de997c8e285e00a8ef17c1a5e4230c9cb. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZFZ22262776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e3a0558ba32f4f147371660b165f19f4a540202f04c88e3c9ecd1f708951a6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TWP011920404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27056bdb2581420d4d6633371977da5df72892fcf91d76430d3891e758b7afe7. 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/TWP011920405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14553f3a696c393db6e8127921262081e41438c7cdd94012f3177e16b0f8e988. 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/TWP011920407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338549106891b14b81da029d7fa5cd5b7624904d692ddb06e9a9ffe4deb39608. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TWP011920408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e3eef9be2a2c8a93a3f0313df2008edc8ad6db1f860f6ea21ceebdf259596b. 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/TWP011920409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdf1417f89fa9c41deb9f569c9e8e93b077caaed190e8eb38b7d18b403f82e5. 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/TWAE32500671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90c2ec13344c79ff10b926d96eff61a5b581a3b69f0332f4b277e2167e21f4a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TWAE32405010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4df70b4962a12f754a58b6abfba7a76f45f79047c1cf1ac0cb21bda0c58072b. 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/TWBF32504002.