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 0x8460a2c5fdefb83af0a7d6bd904d9db88d1f757f91c4415c3182354bacd75b57. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0c71574-427e-45b9-a982-9022514bdaa7.json and https://artists.proofprofile.net/proofs/artist/f0c71574-427e-45b9-a982-9022514bdaa7.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 0x6be5591b2d8665fbd824866d57bfa142a58a443341c6df5140c444e956058239. 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/BRF3Q1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f07b9e8f354ae73ff2bd4f516ccf293ca8b2da7a8afffb8325bb974638bcbe. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/BRF3Q1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86dba4c03dcee92e7f1a1dfada900263ab3ef361f67e03535e7b8fda8a295704. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/BRF3Q2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8523078089efe5ee19ca58132b4ee60150c64252916b8c9a24359a10456dea. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/ITG272500219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7529c86428b20751060973af98dbfd54be9993b295176d362133b99ca854d7b6. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/ITG272500218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c05c26e47e7b2c53636a1b9c6b82c631122dd349a1943638765b70a22d0704. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/ITG272500210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d51eae2280ee351ab8e3cd256120f8f79843534fc5069dd23d1a7ccc00d9981. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITG272500213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7013d57bb8cce88f6efbf11a0bfca17f3599e4be7a3fc2c356c1527cbbd3664. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/ITG272500214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3dfa8e8b37b3d55c3b2598baaba7ad728bd00dda987e2b6c63b8d00c8b799a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ITG272500215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba2d6ad3b165250e17b230b0826d5940c21879a704a146957ae72abcbd981b6. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/ITG272500216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467e552249a3f19e626e03b7200886f59cfa622b9a116003dbb0e12fa96aa2e1. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/ITG272500217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7529c86428b20751060973af98dbfd54be9993b295176d362133b99ca854d7b6. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/ITG272500218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8523078089efe5ee19ca58132b4ee60150c64252916b8c9a24359a10456dea. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ITG272500219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc01e0abbc7db7f4d74fcdc3d5d13b80b03a55bcc07bf242507490f6ac85fbb. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/ITG272500220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d64eeba1902f647c69fd0fa3d8eccd20c2ac701e55d315269b314ddbe23993. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ITG272500221.