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 0x5db0d47c9871d843c2c37e532911ea0746255f3e40ddf09c4af9927eabcf0b78. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/746ad041-6fd7-47c0-8bce-5e5e61f66e21.json and https://artists.proofprofile.net/proofs/artist/746ad041-6fd7-47c0-8bce-5e5e61f66e21.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 0xa0ac220f7a5053c921be87c2a8fd2fc976d79e1ca605b4e0d2a58763fe805171. 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/UKVBF1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b1af8775c54c004f70b20c3e2a3492779359718592beea55bfe3bde86b14a8. 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/UKVBF1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0787c5bc5d02d2c9872b5e41ae441a03c3f7e0dba70d74f30f956167cfe0d8. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/UKVBF1900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ff07355cb906fa4980c45c8f68f7513c76063c661bda8b2962710cbd1295be. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/UKVBF1900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8589c546bf15295ede1d2806de8a1b653b1a8128e99bc103472330c082afb031. 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/UKVBF1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5feb2babfece57db452e1793e106b71e677e2a325f3a9d61b4037539afc9e48. 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/UKVBF1900007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc410996eb231fc2d4580434cf47bf621ed6e14a476d8cbfc3946eb7a6ce32fb9. 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/UKVBF1900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ca81a849b713913cb47f552660ad408bd17a5a27ea2522dfd879a32da1745e. 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/UKVBF1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b1af8775c54c004f70b20c3e2a3492779359718592beea55bfe3bde86b14a8. 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/UKVBF1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74bb099c170bcc03547e8c774aae56e14fa72c2f15107070e9cb04248088b0d. 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/PL29Q2224516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd786f20e9fbc3ff7e8341e670252f41a5c493816730124f21f905f1cc2058130. 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/PL29Q2224526.
Tune of Smooth Nature with Bird and Water Flow Noise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdd1cdb4086f3eb6b398b12d917536b1d4be232f95ab270263a0615272703b5. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/PL29Q2224527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea8da8445be6e326b7f210bd97655ea9a66e18376cbd24b0490884ce97863c46. 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/PL29Q2224533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d373824700bfa2568437689dd9c2e3749d8fe99b6c726050d3606e4faebf265. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/PL29Q2224535.
Music of Smooth Nature with Bird and Water Flow Talk
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85d32d1234fa6f6dce6abc281926c90870a826f397862cf7fe1de58c6ecb556. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/PL29Q2224472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829e98074266c954ed5c390fb01170a1df1caa7f8b0fb66bd81f8f9893bb6008. 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/PL29Q2224485.
Music of Soft River with Bird and Water Flow Noise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf814ebd4a019a5063d1c5dbce4c4ed4b3ae0a3ad85fe8d1a8c9af1be56da97fd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/PL29Q2224673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e799f516e17b881afe463081b692a9475a96172762e5685a9fda664b02bad62. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PL29Q2224683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a18ef6c55b276405800b4cac9ce28d01e76528a327564edf59e933d85ab3faf. 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/PL29Q2224698.
Sounds of Smooth Nature with Bird and Water Flow Noise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6548e4000bbf727d49e215a03c23d6e0bfd781fb6e0aa908b88c079dca2d8555. 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/PL29Q2224602.