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 0xcf58a25cc8b3f40941c1be4f0e66972ded9eec81fae8f27f184b5e52857c2d6f. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c8f6626-bf3d-401c-bff8-ec6cf1fc65ad.json and https://artists.proofprofile.net/proofs/artist/3c8f6626-bf3d-401c-bff8-ec6cf1fc65ad.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 0xe5a979c171915896c2d4fceb1e918e85fd9e4b739abee48cdc6fde82701750e4. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/ZAC581801245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95068be4a47f4a34fdac3e9252f07d38df3ccfbe60fb6658cb1201e7f518e4b. 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/ZAC581801246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd0d14d09f0692e11d1ad915116cd2f0376014b74d48874fe4986207d646782. 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/ZAC581801247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89290cbab0d819d1f350bc218f19ceb64f16aa0d2626e73bfc1638c2ae97f3. 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/ZAC581801248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3573b902eedf5ed51a4150b07800142dcffd4d4ce9429eabce5e891c6277e28f. 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/ZAC581801249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61238300d0d3bf45ca22d1d8f5dda1790368b6a5e0f9a5296f194192682c7014. 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/ZAC581801250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5181244d02f2e2ee8148fbbe2ae904d6ebb4b67bc274ae7fdb315dcd85b848. 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/ZAC581801251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeac08b325dec089360236641405d03732eaed44a18922e9c2c6254eb8f6f30e4. 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/ZAE121300601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf33dfd99c4a99fe46075faf50d8f1d838e087f3671c898f37b6585ade98cc6. 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/ZAE121300602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82985e2076b9f2cd2c32e395bbe480d76789050f6c09917629a6d8965e423bc4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ZAE121300605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a22155eca7a05b49e2bb3caff485d3a0fcb6cb85735777597cac02861c8cc8. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ZAE121300607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3785d69e169fb18776d517d8865a9dcd050d7545eee9270164559719456210b6. 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/ZAE121300608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7473df0c946bcba9694f89e43652ace9adfe426778b625c1955a88fef006ec. 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/ZAE121300609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbafb5213d494f8400682b4770f2e5fa69bda29ef01a45b2b8a33364d6a73b48. 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/ZAE121300610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631ac368108b7da5d4b89857eb9b364590f518fb5ddb9f95e8352fd8befddbc9. 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/ZAE121300611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a9cb3d29aedcb78acd87030af6cf618c2b8222e3c60025cae2818cdafbaa63. 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/ZAE121100300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20cd90ef804e1a1e9fe5a5c26c4619a4e51bc84dda4d592e5695932fef479ad. 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/ZAE121100301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7827ded5a067d1dcb3f935c0e151a69cee3fbf9151c9ce082d52d46e7c4a748a. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ZAE121100302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca029476583f6c24d8a00c785a6c0eada3944173da49554374f86aa6512fc8d. 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/ZAE121100304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845e500bcb6eb808a1008d09fec5aa4a010321e2ff37bbb858b075d9c05e07ae. 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/ZAE121100305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb220c0049e9d5974d91ac016f975d2e58552dbdf9d99cd553b96ad5a479ba5. 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/ZAE121100309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7d6998e86b45c45c0dab9f19e50c0d645ccd2a4c00b494356d39d9982d3cda. 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/ZAE121100310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98200de8cace022b7e8437161d15f1f8fae44a6e09f19933ce90cee792b40ad0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ZAE121100311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a5911ce7cddc84591a12d431d3ca9308856384664f981546cb8bc0fc0a396e. 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/QZK6Q2288273.